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【多选题】
下列描述正确的是（ ）。A.
当详图与被索引出的图样不在同一张图纸时，用细实线在详图符号内画一水平直径，上半圆中注明详图的编号，下半圆注明被索引图纸的编号
B.
施工图中剖视的剖切符号用粗实线表示，它由剖切位置线和投射方向线组成
C.
标高一律以毫米为单位
D.
我国把渤海海平面作为零点所测定的高度尺寸称为绝对标高
E.
图样标注中，轮廓线可以作为尺寸界线来标注
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【简答题】Since it is to ask for sick leave, he often uses it as an excuse for staying away from school.
【单选题】The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
A.
served
B.
serves
C.
is serving
D.
has served
【简答题】酶的底物专一性(substratespecificity)(名词解释)
【简答题】底物专一性(substrate specificity)
【单选题】He often travels, but never takes the plane. He thinks it is ______ .
A.
comfortable
B.
dangerous
C.
effective
【简答题】阅读理解。 Mr. Turner likes fishing. It is his favorite sport. He often fishes for hours without catching anything. But this does not worry him. Some fishermen couldn't catch fish. Sometimes they catch old...
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