在图19—6中，总需求曲线的移动可能是下面哪一项的结果？________。
A. 货币量的增加
B. 外国收入的下降
C. 税赋增加
D. 价格水平下降
E. 预期未来利润率下降
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A segregated ballast system is a system where
A. all ballast is processed through the oily water separator
B. ballast is taken on and discharged through a separate main deck
C. ballast and cargo tanks are separated by cofferdams
D. all ballast lines, tanks, and pumps are independent of those used for oil
The word "off-limit" in the passage may mean
A. off-set
B. off-state
C. within limits
D. beyond the limit
According to the passage, it is recommended that the heat exchanger side be cleaned by
A. flushing with chemical solvent without being dismantled
B. brushing mechanically after being disassembled
C. flushing with flesh water only
D. flushing with clean oil only
为了满足工作要求，活塞销的材料一般选用______并经渗碳、淬火和低温回火处理。I、低碳钢(15钢)，II、中碳钢(35钢)，III、合金调质钢，IV、滚动轴承钢(GCr15)，V、合金渗碳钢(20Cr)
A. I+II+V
B. I+V
C. II+V
D. I+III+V
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