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【单选题】
Choose the word or phrase that is closest in meaning to the underlined part. NASA worked in the 1970s and early 1980s to research the possibilities of using Solar Power Satellite (SPS) systems with large solar arrays that would beam power down to the Earth’s surface via microwaves.A.
shed solar energy to the Earth’s surface from the satellite
B.
set the satellite down to the Earth’s surface with power
C.
shut down the power on the Earth’s surface from the satellite
D.
switch off power to the Earth’s surface from the satellite
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【单选题】活塞与气缸壁之间的润滑方式是
A.
压力润滑
B.
飞溅润滑 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
脂润滑
D.
压力润滑和飞溅润滑同时进行 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】根据《汽车驱动桥修理技术条件》(GB8825-88)的技术要求，圆锥主动齿轮与突缘键槽的侧隙应不大于( )mm。
A.
0.10
B.
0.20
C.
0.25
D.
0.30
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