皮皮学，免费搜题
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搜题
【单选题】
进气道结冰将导致危险的后果,下列描述不正确的是:A.
使进气速度场分布不均匀和使气流发生局部分离,引起压气机叶片的振动
B.
冰屑脱离,进人压气机,而造成压气机的机械损伤
C.
结冰堵塞进气道,使得进入压气机的气流明显减少,导致发动机富油停车
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皮皮学刷刷变学霸
举一反三
【单选题】They’re late. The film _____ for 5 minutes.
A.
has begun
B.
has started
C.
has been on
D.
start
【单选题】They’re late. The film _______ for half an hour.
A.
Has begun
B.
has been on
C.
started
D.
has started
【单选题】They are late. The film __________ for five minutes.
A.
has begun
B.
has started
C.
has been on
D.
began
【单选题】If we ______ late, they ______ what has happened.
A.
are, will be wondering
B.
were; wondered
C.
will be late; will be wondering
D.
are; are wondering
【单选题】No one except two students ______ the meeting. a. has been late for b. have been late for c. was late for d. were later for
A.
has been late for
B.
have been late for
C.
was late for
D.
were late for
【多选题】气相色谱分析法在药品质量分析中的应用包括( )
A.
药材、饮片及制剂中部分农药残留量的检测
B.
中药材中二氧化硫含量测定
C.
酊剂（如藿香正气水、十滴水等）中甲醇、乙醇含量测定
D.
药品中有机溶剂残留量检测
【简答题】No one except two students _____ the meeting. [ ] a. has been late for b. have been late for c. was late for d. were later for
相关题目：
【单选题】They’re late. The film _____ for 5 minutes.
A.
has begun
B.
has started
C.
has been on
D.
start