假定小区输出总功率为46dBm，在2天线时，单天线功率是()
A6dbm
B3dbm
C9dbm
D0dbm
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沥青混合料厂拌再生时，旧料的掺配比例一般控制在()为宜。
The center of flotation of a vessel is ().
A. The center of volume of the immersed portion of the vessel
B. The center of gravity of the water plane
C. That point at which all the vertical downward forces of weight are considered to be concentrated
D. That point at which all the vertical upward forces of buoyancy are considered to be concentrated
所谓“至虚有盛候”指的是
A. 虚实夹杂
B. 真虚假实
C. 真实假虚
D. 虚中央实
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