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【单选题】
一台国外进口的设备中,三相交流异步电动机的频率是 60Hz,额定转速为 1 160 转/分, 则其极数为A.
8
B.
4
C.
6
D.
10
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【简答题】会阴冲洗的病人应取的卧位是
【单选题】Much _____ said about the problem but nothing _____ been done so far .
A.
were，has
B.
is，has
C.
were，had
D.
had been，has
【简答题】So far, almost nothing has been done to ______ the number of vehicles.
【单选题】— How do you like the country life here so far? — ____________.
A.
There is nothing special.
B.
It looks like boring.
C.
It’s too far from the city.
D.
It’s quite different from what I expected.
【单选题】So far nothing ________ Tom.I want to know the reason ________ he hasn't written to me. [ ]
A.
heard from；why
B.
has been heard from；why
C.
was heard from；that
D.
has heard from；that
【单选题】T℃时，A气体与B气体反 应生成C气体。反应过程中A、B、C浓度变化如图（Ⅰ）所示，若保持其他条件不变，温度分别为T 1 和T 2 时，B的体积分数与时间的关系如图（Ⅱ）所示。现向一体积可变的密闭容器中通入等物质的量的A气体和B气体，在恒温条件下发生反应达到平衡状态Ⅰ后，再升高到某温度，继续反应一段时间后达到平衡状态Ⅱ。下列叙述中正确的是（ ）
A.
该反应在高温时才能自发进行
B.
反应从开始到平衡状态Ⅰ的过程中，反应向正向进行，A的体积分数一直在减少
C.
平衡状态Ⅰ到平衡状态Ⅱ的过程中，平衡向逆向移动，A的体积分数一直没有变化
D.
反应从开始到平衡状态Ⅱ的过程中，平衡常数K和A的转化率都是先增大后减少
【单选题】So far we____nothing from him.
A.
have been heard
B.
did not hear
C.
have heard
D.
have not heard
【单选题】We can surely overcome these difficulties _,___ we are closely united.
A.
so far as
B.
so long as
C.
as soon as
D.
as well as
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