单项选择题
Having been attacked by terrorists, ____________.
A.doctors came to their rescue
B.the tall building collapsed
C.an emergency measure was taken
D.warnings were given to terrorists
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单项选择题
一种灭虫药粉30kg,含药率是15%。现在要用含药率较高的同种灭虫药粉50kg和它混合,使混合后的含药率大于20%且小于35%,则所用药粉的含药率x的范围是( )。(A)15%<x<23% (B) 15%<x<35% (C)23%<x<47% (D) 23%<x<50%
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多项选择题
教师的教学效能感包括( )。A.自我效能感B.一般交易效能感C.集体效能感
A.自我效能感
B.一般交易效能感
C.集体效能感
D.个人教学效能感
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