【简答题】齿轮传动的润滑方式主要根据齿轮的 选择。
【单选题】某人的血细胞与B型血的血清凝集,而其血清与B型血的红细胞不凝集,此人血型是:
【单选题】The author of the passage points out that ______.
A.
keeping cash is the only way to avoid risks
B.
the longer you own a stock, the more you lost
C.
the high rate of profit and high rate of risk coexist in stocks
D.
the best way to accumulate wealth is by investing in stocks
【单选题】The motorist had to __________ to avoid knocking the old woman down in the middle of the road.
【简答题】齿轮传动的润滑方式主要根据齿轮的圆周速度选择。闭式齿轮传动采用油浴润滑时的油量根据 确定。
【单选题】Parents should help their kids to avoid overusing cell phone or social websites in general.
A.
父母应该帮助孩子们避免过度使用一般的社交网址和手机
B.
父母应该帮助孩子避免过度使用手机和一般社交网站。