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【单选题】How should one invest a sum of money in these days of inflation (通货膨胀) Left in a bank it will hardly keep its value, however high the interest rate is. Only a brave man, or a very rich one, dares to b...
A.
suggest human beings are controlled by a clock
B.
describe why clocks can rule the planet Earth
C.
tell readers what clocks look like
D.
compare clicks to human beings
【单选题】Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to the mysteries of cosmogony in an 1848 public lecture, just reprinted by...
A.
cosmogonists have more disagreements about the distant outer space
B.
astronomers have already obtained full knowledge about Uranus and Neptune
C.
there exist a lot of mysteries for cosmogonists in inner space
D.
cosmogonists are often reluctant to go home for the existence of deeper family mysteries
【单选题】关于压缩空气起动的正确论述 。 I.起动空气应有足够压力和一定储量 II.起动空气必须在膨胀行程中进入气缸 III.四冲程柴油机起动最少有4个气缸 IV.二冲程进气延续角约为100°曲轴转角 V.达到起动转速后柴油机才能发火起动 VI.二冲程柴油机起动最少有六个气缸
A.
Ⅰ+Ⅱ+Ⅲ+Ⅳ
B.
Ⅰ+Ⅱ+Ⅳ+Ⅴ
C.
Ⅱ+Ⅲ+Ⅳ+Ⅴ
D.
Ⅱ+Ⅳ+Ⅴ+Ⅵ