镉镍蓄电池在常温下贮存1个月,镉镍蓄电池自放电量约为()。
A. 10%
B. 30%
C. 40%
D. 50%
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For a floating vessel,the center of flotation is the point in the waterplane().
A. about which the vessel lists and trims
B. which coincides with the center of buoyancy
C. which,in the absence of external forces,is always vertically aligned with the center of gravity
D. which is shown in the hydrostatic tables as VCB
一般场所插座安装高度不宜小于()m.
A. 0.3
B. 1.3
C. 1.8
以下对脱模斜度取值说法不正确的是()。
A. 塑件精度高,选用较小脱模斜度
B. 塑件形状复杂不易脱模,选用较大脱模斜度
C. 模具结构复杂,选用较大脱模斜度
D. 收缩率大,斜度加大