When floor plates are slippery with oil, there is a riske of ()
A. making footholds insecure
B. causing head injuries
C. causing engine troubles
查看答案
将“口父咀”改为“细切”始于
A. 《证类本草》
B. 《肘后备急方》
C. 《炮炙大法》
D. 《本草经集注》
E. 《神农本草经》
are used to handle anchors and chains
A. Cargo winches
B. Cargo hatches
C. Windlasses
平车、凹底平车、长大平车局部承受货物重量，货物（）小于所需两横垫木之间的最小距离时，可按需要先铺设两根横垫木，然后在横垫木上加纵垫木，将货物均衡地装在纵垫木上。
A. 支重面宽度
B. 支重面长度
C. 实际长度
D. 实际宽度
Retrograde motion is the ().
A. Movement of the points of intersection of the planes of the ecliptic and the equator
B. Apparent westerly motion of a planet with respect to stars
C. Movement of a superior planet in its orbit about the Sun
D. Movement of the celestial north pole in an elliptical pattern in space
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