国有资产控股企业经营者的期股,每年所获红利应首先用于归还因购买期股的赊帐和贴息、低息贷款部分。
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An aneroid barometer is an instrument().
A. used to measure the speed of wind
B. in which the pressure of the air is measured
C. that tells which direction a storm is coming from
D. used to measure the height of wave
金属结构在某些条件下其强度可能减小,这些条件叫做应力集中。为什么修理后要恢复某些板件的应力集中()
A. 增加刚性
B. 增加强度
C. 为了变形吸收能量