【判断题】当把P型半导体和N型半导体结合在一起时,在两者的交界处形成一个PN结。
【多选题】Which of these sentences are true about cloud seeding, according to the passage?
A.
China carries out more cloud seeding than anywhere else.
B.
Cloud seeding is too expensive for most countries.
C.
Cloud seeding is mostly done for scientific rather than economic reasons.
D.
Cloud seeding helps turn dry areas of land into agricultural areas.
E.
Cloud seeding may affect the distribution of rainfall.
【判断题】对于十字轴式万向节来说,主、从动轮的尖角越大,则传动效率越高。
【简答题】These sentences are about the reading. Complete them with the target words and phrases in the box.
【简答题】These sentences are about the reading. Complete them with the target words and phrases in the box.
【单选题】U 盘是采用 作为存储器的移动存储设备。