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【判断题】
CO是在碳的氧化反应过程中，因氧气充足而生成的产物。A.
正确
B.
错误
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【单选题】GM Organisms By far the most common genetically modified (GM) organisms are crop plants. But the technology has now been applied to almost all forms of life, from pets that glow under UV light to bact...
A.
Y
B.
N
C.
NG
【单选题】如图 5 所示, 10 匝矩形线框在磁感应强度为 B =√ 2/10 T 的匀强磁场中,绕垂直磁场的轴 OO ′以角速度 ω = 100 rad/s 匀速转动,线框电阻不计,面积为 S = 0.3 m 2 ,线框通过滑环与一理想变压器的原线圈相连,副线圈接有两只灯泡 L 1 (0.3 W,30 Ω) 和 L 2 ,开关闭合时两灯泡均正常发光,且原线圈中电流表示数为 0.04 A ,则下列判断不正...
A.
．若从图示线框位置开始计时，线框中感应电动势的瞬时值为 30 cos (100 t ) V
B.
．理想变压器原、副线圈匝数比为 10 ∶ 1
C.
．灯泡 L 2 的额定功率为 0.9 W
D.
．若开关 S 断开，电流表示数将增大
【单选题】Which of the following is NOT the reason given by advocates of GM crops?
A.
GM crops can produce more nutritious foods.
B.
GM crops can be greatly helpful in feeding the growing population of the world.
C.
GM crops will benefit the environment by requiring fewer pesticides.
D.
GM crops can simplify operation in growing crops.
【判断题】In an automatic transmission, the gears are never physically moved and are always engaged to the same gears.
A.
正确
B.
错误
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