汽缸勾贝即汽缸活塞,它在锅炉送来的蒸汽作用下,在汽缸内高速往复运动。

题型:判断题

问题:

汽缸勾贝即汽缸活塞,它在锅炉送来的蒸汽作用下,在汽缸内高速往复运动。

考点:蒸汽吊起重工高级蒸汽吊起重工高级蒸汽吊起重工题库
题型:判断题

下图为一正在测量中的多用电表表盘

(1)如果是用×10 Ω挡测量电阻,则读数为­­        Ω.

(2)如果是用直流10 mA挡测量电流,则读数为       mA.

(3)如果是用直流5 V挡测量电压,则读数为         V.

题型:判断题

下列关于活动课程的描述,不正确的是()。

A.以儿童为中心,依据儿童当前的兴趣与需要来设置课程

B.打破学科界限,按活动主题来组织学习经验

C.课程组织心理学化,要求按儿童心理发展的顺序与特点来组织课程

D.活动课程即是通常所讲的课外活动

题型:判断题

计算题:1000瓦电炉,在220伏额定电压下使用,通过它的额定电流是多少?如果平均每天使用2小时,问一个月消耗多少电(一个月以30天计算)?

题型:判断题

长波紫外线的波长范围为()

A.500~450nm

B.450~400nm

C.400~320nm

D.320~280nm

E.280~180nm

题型:判断题

Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is (1) only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, (2) embarrassed. You have to take a commuter train any morning or evening to (3) the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. (4) , there is an unwritten but clearly understood code of behavior which, (5) broken, makes the offender immediately the object of (6) .

It has been known as a fact that a British has a (7) for the discussion of their weather and that, if given a chance, he will talk about it (8) . Some people argue that it is because the British weather seldom (9) forecast and hence becomes a source of interest and (10) to everyone. This may be so. (11) a British cannot have much (12) in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong (13) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (14) .

Foreigners may be surprised at the number of references (15) weather that the British make to each other in the course of a single day. Very often conversational greetings are (16) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (17) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. (18) he wants to start a conversation with a British but is (19) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (20) an answer from even the most reserved of the British.

16()

A.started

B.conducted

C.replaced

D.proposed

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