关于锚杆角度,锚杆方向与井巷轮廓线(或岩层层理)角度(限值)为()A、≤15°B、≤

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问题:

关于锚杆角度,锚杆方向与井巷轮廓线(或岩层层理)角度(限值)为()

A、≤15°

B、≤10°

C、≤20°

D、≤30°

考点:支护工考试锚杆支护工锚杆支护工题库
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2007年10月24日18时29分,搭载中国首枚绕月探测卫星“嫦娥一号”的“长征三号甲”火箭成功地将嫦娥一号卫星送入太空,在嫦娥一号卫星飞向38万公里外月球的漫长旅途中,需要进行一系列高度复杂又充满风险的动作,即三次绕地球变轨,然后进入月地转移轨道,再三次绕月球变轨,最后绕月球做圆周运动,如图1-1-3所示,是“嫦娥一号”升空路线图,下列说法正确的是(    )

A.图中描述卫星绕地球运行情景的四个椭圆轨道是以地球作参考系

B.图中描述卫星绕月球运动情景的三个椭圆轨道是以地球作参考系

C.图中描述卫星在月地转移轨道的运动情景是以太阳作参考系

D.图中描述卫星运动情景的所有轨道均是以太阳作参考系

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Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.

In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (61) part-time jobs while they are studying here.

51().

A. establish

B. purchase

C. prove

D. attend

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以辉绿岩、玄武岩等天然岩石为主要原料制成的铸石管,其主要特点有()。

A.耐磨

B.耐腐蚀

C.具有很高的抗压强度

D.具有很高的抗冲击韧性

题型:单项选择题

水平气压梯度力的大小与水平气压梯度成正比,与空气密度成反比,其方向为()。

A.平行等压线并与风向一致

B.垂直等压线由高压指向低压

C.斜穿等压线由高压指向低压

D.垂直等压线由低压指向高压

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《储蓄国债(电子式)管理办法》规定,储蓄国债(电子式)投资者可到账户所在的承销团成员注销本人托管余额为零的个人国债账户。对于连续()年余额为零的只办理储蓄国债(电子式)业务的个人国债账户,承销团成员有权予以注销。

A、1年

B、3年

C、5年

D、10年

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