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【单选题】
It is not easy to ______ between words which look or sound alike or which have nearly the same meaning.A.
define
B.
detect
C.
distinguish
D.
differ
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【单选题】喀斯特地貌又称( ),是指地下水和地表水对以碳酸岩为代表的可溶性岩石进行破坏和改造而形成的地貌。
A.
石英砂岩峰林地貌
B.
丹霞地貌
C.
岩溶地貌
D.
花岗岩地貌
【单选题】During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure __________.
A.
effective cylinder scavenging and cooling
B.
constant pressure from the turbochargers
C.
cooler operation of the exhaust system
D.
effective constant pressure for turbocharger operation
【判断题】It is professional to talk about business collegues during business meal conversation.()
A.
正确
B.
错误
【简答题】MCS-51芯片的内部有( ),用于产生时钟信号送给单片机内部各电路,控制并使它们有节拍地工作。
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