题目内容

合成材料中,尼龙是用哪个符号表示()。

A. PE
B. PVC
C. PA
D. NL

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所有中枢神经系统肿瘤均应行术后常规放疗。

A. 正确
B. 错误

The suggestion that the CEO()the prizes is welcomed by all.

A. would present
B. present
C. presents
D. ought to present

年度内发生的记账串户,可编制()办理冲正。

Since the good sare()stock,they cannot be supplied()stock.

A. out of,at
B. outside,from
C. without,from
D. out of,ex

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