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【单选题】
将总体单位先按某种标志分组，然后在各组中采用简单随机或机械抽样方式，确定所要抽取的样本的单位的抽样方式是（）A.
等距随机抽样；
B.
分层随机抽样；
C.
分群随机抽样；
D.
非随机抽样。
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皮皮学刷刷变学霸
举一反三
【单选题】The ice on the front windshield of the car had formed when moisture condensed during the night. The ice melted quickly after the car was warmed up the next morning because the defrosting vent, which b...
A.
The side windows had no ice condensation on them.
B.
Even though no attempt was made to defrost the back window, the ice there melted at the same rate as did the ice on the front windshield.
C.
The speed at which ice on a window melts increases as the temperature of the air blown on the window increases.
D.
The warm air from the defrosting vent for the front windshield cools rapidly as it dissipates throughout the rest of the car.
E.
The defrosting vent operates efficiently even when the heater, which blows warm air toward the feet or faces of the driver and passengers, is on.
【简答题】当 采用独立悬架时,转向传动机构布置形式应采用 ( ) 转向梯形。
【多选题】Which of the following words describes 'a mirror in the center of the windshield that allows a person to see what’s behind an automobile. ' ?
A.
rear windshield
B.
mirror
C.
rearview mirror
D.
windshield
【简答题】Windshield
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