设A,B,C为三个任意集合,则:
A∩(B-C)=(A∩B)-(A∩C).
第2题
A wind tunnel can be used to find out ________.
[A] how fast a plane can rise
[B] how smooth a plane’s surface is
[C] if a plane can land in a very strong wind
[D] if a plane will drop when flying at a low height
第3题
Hardly ______when they ran toward it.
A. had the plane landed
B. did the plane land
C. the plane had landed
D. the plane landed
第4题
第5题
Hardly ______ when they ran toward it.
A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed
第6题
Hardly______when they ran toward it.
A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed
第7题
A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed
第8题
Hardly ______ when they ran toward it.
A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed
第9题
Hardly ______when they ran toward it.
A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed
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