α-丁酸萘酚酯酶（α-NBE）染色时与重氮盐偶联成有色沉淀的是（）
A.α-丁酸
B.α-萘酯
C.α-萘酚
D.α-酯酶
E.α-丁酸萘酚
参考答案：C
—Tom graduated from college at a very young age.
—Oh,he__________have been a very smart boy then.
A．could
B．should
C．might
D．must
影响制冷效果的原因有哪些？
