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问题 选择题
下面属于升华现象的是（   ）

A．放在冰箱的矿泉水变成冰块

B．在衣柜里的“樟脑丸”（萘）放久后变小了

C．冻肉出冷库后比进冷库时重

D．铁水倒进模具中，冷却后变成车轮

答案

答案：B

单项选择题

TCR识别抗原的信号转导是通过（）

A.CD2

B.CD3

C.CD4

D.Igα、Igβ

E.CD8
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选择题

Despite the fact that they feel stressed, exhausted, and even sick, motivated by the high level of

competition, students take          necessary to keep up with their routine.[ ]

A. whatever steps

B. what steps

C. no matter what steps

D. no matter how steps
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