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【简答题】
（x+2） 2 -2x-3=O．
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举一反三
【单选题】The company has ___________ into a major chemical manufacturer.
A.
evolve
B.
involve
C.
revolve
D.
convolve
【单选题】The company has ___________ into a major chemical manufacturer.( ) A. evolve B. involve C. revolve D. convolve
A.
evolve
B.
involve
C.
revolve
D.
convolve
【单选题】The products of the chemical industry make a major contribution to present-day standards of living, and life today______impossible without these products.
A.
is
B.
has been
C.
would be
D.
would have been
【单选题】ATP is the cells ’ major chemical form of energy, and often it is converted to ADP during reactions, thereby releasing energy to allow the reaction to proceed in the forward direction. The highest ene...
A.
Adenosine and phosphate
B.
Ribose and phosphate
C.
Ribose and adenine
D.
Two hydroxyl groups in the ribose ring
E.
Two phosphate groups
【单选题】如图所示,由三根细绳悬挂在横木上,三根细绳的末端都悬挂了金属重物。绳1和绳3长度相同。绳2较短。在绳1和绳2末端悬挂10单位的重物。在绳3的末端悬挂5单位的重物。悬挂重物的细绳可以来回摆动,且摆动的周期可以测量。如果你想研究细绳的长度是否对摆动周期有影响。 你会用哪一个或一组细绳进行测试?
A.
只需用其中任何一根细绳
B.
需用全部三根细绳
C.
绳2和绳3
D.
绳1和绳3
E.
绳1和绳2
【简答题】热机是将 转变成 的能量转换工具。 工质的热力状态通常用 、 比容 和 等基本状态参数来表示。
【单选题】Which would be the major responsibility (责任，职责) of the chemical engineer?
A.
direct research and development work
B.
perform. chemical analysis (分析)
C.
supervise (监督，指导) production work
D.
direct other workers
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