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【单选题】
理想纯微分环节对数幅频特性曲线是一条斜率为( )的直线。A.
+20dB/dec
B.
-20dB/dec
C.
0dB/dec
D.
+40dB/dec
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举一反三
【单选题】What is a roundabout?
A.
It is a circular area in the middle of a crossing where there are no traffic lights.
B.
It is a place in a port where ships are loaded, unloaded, or repaired
C.
It is a large building for storing large quantities of goods
【简答题】The compass(罗盘) is a device that is absolutely necessary for the【56】of ships and airplanes. Hikers often need a compass, too. Anyone who does not use 【57】roads should have a compass. A compass will al...
【简答题】听下面一段材料, 回答第1至4题. 1. Where did the British ships land in 1607? A. The Atlantic Ocean. B. The Mississippi. C. Virginia. 2. How did people find names for areas of the new land? A. They invented their ow...
【单选题】The Bermuda Triangle There is a place in the Atlantic Ocean where ships and airplanes seem to disappear more often than anywhere else on Earth. It seems to form. a triangle between Miami, Bermuda, and...
A.
Y
B.
N
C.
NG
【单选题】与氨基酸代谢有关的途径中,下列哪项对氨基酸分解和合成都起着主要作用
A.
联合脱氨基作用
B.
嘌呤核苷酸循环
C.
鸟氨酸循环
D.
蛋氨酸循环
E.
葡萄糖一丙氨酸循环
【判断题】食物蛋白质经消化吸收的氨基酸(外源性氨基酸)与体内组织蛋白质降解产生的氨基酸及体内合成的非必需氨基酸(内源性氨基酸)混在一起,分布于体内各处参与代谢,称为氨基酸代谢库(metabolic pool) 。
A.
正确
B.
错误
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