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问题
单项选择题
DRAPL在退火炉事故时的最低保温温度为()℃。
A:300;
B:400;
C:500.
答案
参考答案:
C
选择题
The boy wanted to put some ointment on burns, but his mother told him _____.
A. not to do
B. not to
C. didn't
D. not to them
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填空题
故障的风险级别可分为()故障、()故障和()故障。
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