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【单选题】
Only a small part of the sun's energy reaches the earth's surface because most of it is______.
A.
absorbed by the clouds in the lower atmosphere
B.
reflected by the gases in the upper atmosphere
C.
lost in the upper and lower atmosphere
D.
used to evaporate water from the oceans and lakes
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参考答案:
举一反三
【单选题】下列哪个选项不属于气动执行元件?
A.
电磁阀
B.
气缸
C.
气动马达
【简答题】What were you up to when your parents came in?A. ____ for a while and ____ some reading. B. was playing; was going to do B. played; did C. had played; was going to do D. had played; did
【单选题】可用于治疗白细胞减少症的细胞因子是
A.
IL-2
B.
IL-11
C.
IFN-γ
D.
EPO
E.
M-CSF
【判断题】工作零线不得在漏电保护器负荷侧重复接地,否则漏电保护器不能正常工作。
A.
正确
B.
错误
【判断题】与十进制数63相应的二进制数是 00111111
A.
正确
B.
错误
【判断题】腘淋巴结浅群沿小隐静脉末端排列,引流外侧缘和小腿后外侧部的浅淋巴管。
A.
正确
B.
错误
【简答题】vray渲染器的英文缩写为 。
【简答题】作业调度和进程调度各自的主要功能是什么?
【简答题】暴露金属最少的卡环是
【简答题】培养条件下细胞有哪些特点?
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