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【单选题】
迎宾活动一般提前多长时间到达迎宾地点A.
30分钟
B.
20分钟
C.
15分钟
D.
10分钟
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反馈参考答案：
举一反三
【单选题】Nitrous oxide comes from car exhausts and from chemical fertilizers. ( )
A.
gas which is produced by cars
B.
oil used for driving
C.
waste oil discarded
D.
devices that burn oil
【简答题】1/2英寸、3/4英寸管子的公称直径分别为（）mm和（）mm。
【简答题】根据句意及首字母提示完成单词。 1. This is my mother's s ______ . She is my aunt. 2. My father's brother is my u ______ . 3. My father's mother is my g ______ . 4. Meimei is my good f ______ , but we aren't in the sa...
【单选题】The chemical cargo has the characteristic of _____ to be paid sharp attentions during sea transportation.
A.
flammability
B.
toxicity
C.
corrosivity
D.
all of the above
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