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【单选题】
和白炽灯泡相比,下列不属于LED的优点是( )。A.
节能省电
B.
超长寿命
C.
健康环保
D.
价格低廉
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皮皮学刷刷变学霸
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【简答题】液体定量灌装,首先想到的定量设备是( )。生活中类似的设备名称( )
【简答题】在更换制动系统零部件时,制动液压管路可能会进入空气,制动分泵上有______,用于排放空气。
【简答题】A．Put the homework on Don's desk. B．Leave the key for Don. C．Give Don's students the next assignment. D．Call Don at the end of the afternoon.
【单选题】Class regulations require _____ is the last to leave the classroom _____ off all the lights.
A.
who; should turn
B.
whom; shall turn
C.
whomever; turns
D.
whoever; turn
【单选题】Students who leave school in the spring and look for work are one source of ________.
A.
structural unemployment
B.
cyclical unemployment
C.
frictional unemployment
D.
business-cycle fluctuations
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