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【多选题】
亚音速气流流过收缩管道,其气流参数如何变化?A.
速度降低,压强下降
B.
速度增加,压强增大
C.
速度增加,压强下降
D.
速度降低,压强增大
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【简答题】郭念峰老师提出的判断正常异常的三原则
【单选题】The higher the cetane number, _____ the ignition quality of the fuel.
A.
the worse
B.
the better
C.
the smaller
D.
the greater
【单选题】With economy increasing steadily, people ______ enjoy a life of higher quality.
A.
should
B.
can
C.
may
D.
must
【单选题】In author's opinion, the sudden appearance of higher-quality goods suggests its officials ______.
A.
become more concerned about the quality and domestic market
B.
turn to other ways to stimulate and enforce export rules
C.
have to improve goods' quality for the qualification of exports
D.
want consumers to buy better products at low prices
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