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【简答题】
因自然灾害、设备故障、施工、事故等造成双线之一不能行车时,列车调度员应发布双线自动闭塞区间改为单线行车的调度命令,凭列车调度员发布的“()”调度命令,双线自动闭塞区间改按单线行车。
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举一反三
【单选题】Every necessary means____ to protect milu deer which____ very valuable to us. As a result, the number of milu deer is increasing. [ ]
A.
are used; is
B.
is being used; is
C.
have been used; are
D.
has been used; are
【简答题】rational
【单选题】True, 10__________________________ but it's vital we find the rational ways of fishing before every ocean becomes a dead sea.
A.
some countries are beginning to deal with this problem
B.
some countries are beginning to deal with these problems
【单选题】下述那种溶剂,全部为亲水性溶剂的是( )
A.
MeOH、Me2CO、EtOH
B.
nBuOH 、 Et 2 O 、 EtOH
C.
nBuOH 、 MeOH 、 Me 2 CO 、 EtOH
D.
EtOAc 、 EtOH 、 Et 2 O
【简答题】A．logical B．sensational C．emotional D．rational
【简答题】理性预期(rational expectations)
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