题目内容

A revised print of a chart is made （）.

A. after every major hydrographic survey of the area covered by the chart
B. when there are numerous corrections to be made or the corrections are extensive
C. when a low-stock situation occurs and minor corrections are made
D. every two years to update the magnetic variation informatio

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论述教师职业角色的多样化.

关于样式表的优先级说法不正确的是（）

A. 直接定义在标记上的css样式级别最高
B. 内部样式表次之
C. 外部样式表级别最低
D. 当样式中属性重复时先设的属性起作用

机电检修无措施施工或未办理相关票证的，应挂（）。

A. 红牌
B. 黄牌

The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

A. shims
B. packing
C. glands
D. washer