切削纯铜.不锈钢等高塑性材料时,应选用直线圆弧型或直线型断屑槽。
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先天性肾上腺皮质增生症失盐型,电解质改变的特点为________、________。
船舶在浅水区航行,如水深沿船宽分布不均匀,会出现船首向()现象.
A. 浅水一侧偏转
B. 左侧偏转
C. 深水一侧偏转
D. 右侧偏转
担任领导职务的公务员和公务员中的领导成员辞职有哪些规定?
High-speed rotation in a centrifugal purifier can produce a force () the force of gravity.
A. many thousand times larger than
B. the same as
C. many thousand times smaller
D. none of the above