单项选择题

蓄电池在使用过程中，要注意检查电解液的高度，其标准高度是

A．比极板组高15mm
B．与极板组平行
C．比极板组略低
D．没有严格要求，可高可低

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Long Arm Statutes （）
A、A plea consisting in two or more distinct grounds of complaint or defense for the same issue.
B、Statutes that allow local courts to obtain jurisdiction over nonresident defendants when the cause of action is generated locally and affects local plaintiffs.
C、The punishability of a crime in both the country where a suspect is being held and a country asking for the suspect to be handed over to stand trial.
D、A set of principles permitting greater opportunity or greater lenience for one class of people than for another, usu. based on a difference such as gender or race

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当两被联接件之一太厚，不宜制成通孔，且需要经常拆卸时，往往采用( )。
A、螺栓联接
B、螺钉联接
C、双头螺柱联接
D、紧定螺钉联接