主轴增量式编码器的A、B相脉冲信号可作为()。A.主轴转速的检测 B.主轴正、反转的

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问题:

主轴增量式编码器的A、B相脉冲信号可作为()。

A.主轴转速的检测

B.主轴正、反转的判断

C.作为准停信号

D.手摇脉冲发生器信号

考点:数控机床操作工考试数控机床操作工考试题库
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抗酸染色后细菌呈细长略带弯曲红色杆菌是()

A.白喉杆菌

B.结核分枝杆菌

C.霍乱弧菌

D.肺炎链球菌

E.炭疽芽孢杆菌

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大于2,小数部分是两位小数:______.

题型:单项选择题

阅读理解。

     MONTREAL (Reuters)-Crossing the US-Canada border (边界) to go to church on a Sunday cost a US

citizen $10,000 for breaking Washington's strict new security (安全) rules.

     The expensive trip to church was a surprise for Richard Albert, who lives right on the Canadian border.

Like the other half-dozen people of Township 15, crossing the border is a daily occurrence for Albert. The

nearby Quebec village of St. Pamphile is where they shop, eat and go to church.

     There are many such situations in these areas along the largely unguarded 5,530-mile border between

Canada and the US-which in some cases actually runs down the middle of streets or through buildings.

     As a result, Albert says he did not expect any problems three weeks ago when he returned home to the

US after attending church in Canada, as usual. The US customs (海关) station in this are is closed on

Sundays, so be just drove around the locked gate, as he had done every weekend since the gate appeared

last May, following a tightening of border security. Two days later. Albert was told to go to the customs

office, where an officer told him be had been caught on carnera crossing the border illegally (非法).

     Ottawa has given out special passes to some 300 US citizens in that area so they can enter the country

when Canadian customs stations are closed, but the US stopped a similar program last May. That forces the

people to a 200-mile detour along hilly roads to get home through another border checkpoint.

     Albert has requested that the customs office change their decisions on the fine, but he has not attended a

Sunday church since. "I feel like I'm living in a prison," he said.

1.We learn from the text that Richard Albert is _____.

A. an American living in Township 15

B. a Canadian living in a Quebec village

C. a Canadian working in a customs station

D. an American working in a Canadian church

2. Albert was fined because he _____.

A. failed to obey traffic rules

B. broke the American security rules

C. worked in St. Pamphile without a pass

D. damaged the gate of the customs office

3. The underlined word "detour" in paragraph 5 means _____.

A. a drive through the town

B. a race across the fields

C. a roundabout way of travelling

D. a journey in the mountain area

4. What would be the best title for the text?

A. A Cross-country Trip

B. A Special Border Pass

C. An Unguarded Border

D. An Expensive Church Visit

题型:单项选择题

角接取压中前后环室与孔板上下游侧端面形成的前后环腔,通过不少于四个的断续环隙与管道相通,每个断续环隙的面积不得小于()mm2

A.10

B.9

C.12

D.8

题型:单项选择题

认识过程的复杂性()

A.受社会历史条件的限制

B.受主体认识能力、知识水平的限制

C.受人的身体素质的限制

D.受客观条件的限制

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