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【单选题】
为了使液压系统中的压力控制稳定,主要用于低压液压系统的压力控制阀用( )A.
先导型减压阀
B.
直动型减压阀
C.
直动型溢流阀
D.
先导型溢流阀
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举一反三
【简答题】Generally speaking,____________(按照说明时), the drug has no side effect.
【单选题】There are some social problems in the United States. And drug abuse has come to be 【21】______ as one of the most challenging social problems facing the nation. Indeed, the very word' drug' excites str...
A.
regarded
B.
respected
C.
referred
D.
treated
【单选题】For years the strategy against drug ______.
A.
hasn't worked as desired
B.
has encouraged the supply of drug
C.
hasn't cut off the networks that distribute drug
D.
has cracked clown on drug consumers
【单选题】Anti-drug work has become a ______ of attention among the international community with the spread of drug abuse in the world.
A.
spot
B.
center
C.
zoom
D.
focus
【简答题】For most drug users, their ______ has something to do with theist psychological addiction.
【单选题】正常物品价格上升导致需求量减少的原因在于
A.
替代效应使需求量增加，收入效应使需求量减少
B.
替代效应使需求量增加，收入效应使需求量增加
C.
替代效应使需求量减少，收入效应使需求量减少
D.
替代效应使需求量减少，收入效应使需求量增加
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