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【多选题】
下列元件属于流量控制阀的是 。A.
溢流阀
B.
节流阀
C.
调速阀
D.
单向阀
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举一反三
【单选题】Jim failed his driving test on the first _________________.
A.
adventure
B.
attempt
C.
aspiration
D.
process
【简答题】Part B For this part, you should write a composition with the title 'Pollution in Our City'. Based on the following: (1) Pollution in our city is getting worse and worse. (2) People have realized the ...
【单选题】Jim ______ his strict father, for he failed in the examination once again.
A.
didn't dare to see
B.
not dare to see
C.
didn't dared to see
D.
dare not to see
【简答题】若混合气体中氨的体积分率为0.5,其摩尔比为()A. 0.5 B. 1 C. 0.3 D. 0.1
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