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【单选题】
下列肿瘤中不属于恶性肿瘤的是A.
视网膜母细胞瘤
B.
神经母细胞瘤
C.
肾母细胞瘤
D.
骨母细胞瘤
E.
肝母细胞瘤
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举一反三
【单选题】Hardly the helicopter _______ when the waiting crowd ran toward it.
A.
had...landed
B.
has...landed
C.
did...landed
D.
was... landing
【单选题】Hardly______ the helicopter______ when the waiting crowd ran toward it.
A.
had landed
B.
has landed
C.
did land
D.
was landing
【单选题】According to gyroscopic precession, if the rotor disc wants to tilt forward, which direction the pitch angle has to increase? Assuming the main rotor rotates counterclockwise,and 3-o'clock is on the r...
A.
3-o'clock
B.
6-o'clock
C.
9-o'clock
D.
12-o'clock
【简答题】Hardly ________ the helicopter ________ when the waiting crowd ran toward it. A) had ..., landed B) has ..., landed C) did..., land D) was..., landing
【单选题】A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.
A.
proceed with fueling operation
B.
have helicopter move to a safer location
C.
wash spilled fuel away with a flood of water
D.
clean spilled fuel with rags
【单选题】The FBI has been called in to help __________ the tragic helicopter crash that killed NBA champion Kobe Bryant, and his teenage daughter.
A.
neglect
B.
investigate
C.
insert
D.
emerge
【简答题】Hardly ________ the helicopter ________ when the waiting crowd ran toward it. A) has ... landed B) had ... landed C) would ... land D) was ... landing
【单选题】Hardly_____ the helicopter______ when the waiting crowd ran towards it.
A.
has…landed
B.
had…landed
C.
would…land
D.
was…landing
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