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【单选题】
脉冲爆震发动机是一种利用脉冲式爆震波产生推力的新概念发动机,其中吸气式脉冲爆震发动机适合()飞行。A.
大气层内
B.
外层空间
C.
大气层内和大气层外
D.
增压
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皮皮学刷刷变学霸
举一反三
【单选题】There are four ________ students in our school.
A.
hundred
B.
hundreds
C.
hundreds of
D.
hundred of
【简答题】is only to kill pathogenic bacteria and destruct all nutrient cells or some spores in physic and chemical ways.
【单选题】On National day__ people take part in all kinds of celebration. A. hundreds of millions of B. millions of hundred of C. hundreds millions of D. millions hundreds of
A.
hundreds of millions of
B.
millions of hundred of
C.
hundreds millions of
D.
millions hundreds of
【单选题】There are four ________ students in our school.
A.
hundred
B.
hundreds
C.
hundreds of
【单选题】________people listened to the concert.
A.
Hundred of
B.
Hundreds of
C.
Hundred
D.
Hundreds
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