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【单选题】
The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs.This procedure should not be used ().A.
when the declination and latitude are of different names
B.
when the declination is greater than and the same name as the latitude
C.
if the vessel is stopped or making bare steerageway
D.
on a fast vessel on northerly or southerly headings
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【简答题】如图所示电路，关闭开关S后，电压表示数为12伏，电流表示数0.6安，电阻R 2 阻值为40欧， 求： （1）电阻R 1 的阻值； （2）通过R 2 的电流； （3）总电流是多少？
【单选题】I (got to) the airport, only (to find) that the plane (had left) (for ten minutes).
A.
got to
B.
to find
C.
had left
D.
for ten minutes
【简答题】如图所示电路,R1=R2=12Ω,电源电压为18V,求: (1)R1、R1并联后的总电阻是多少? (2)电流表的读数是多少?
【简答题】They only got here twenty minutes _____.