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【简答题】
正弦交流电路中某负载的电压为500V,电流为10A,电压比电流落后30度,则有功功率、无功功率、视在功率分别为多少?
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【单选题】There are very few rules of grammar______.
A.
that are not with exceptions
B.
not having exception to them
C.
that do not have exceptions
D.
not with exception to them
【单选题】—The old store enjoys a good reputation in this area. —Can’t agree more. There are very few. _____, complains about their service.
A.
if any
B.
if ever
C.
if so
D.
if anything
【简答题】CA 的四大职能是 ___________ 、证书更新、 ______________ 和证书验证。
【单选题】In perfect competition,______.
A.
there are very few firms in the market
B.
there is a homogeneous product
C.
there are large barriers to entry
D.
there is imperfect information between consumers and producer
【单选题】There are very few rides of grammar______.
A.
that are not with exceptions
B.
but have exceptions
C.
not having exception to them
D.
not with exception to them
【简答题】CA 的四大职能是 ___________ 、证书更新、 ______________ 和证书验证。
【单选题】If consumers think that there are very few substitutes for a good, then
A.
supply would tend to be price elastic.
B.
supply would tend to be price inelastic.
C.
demand would tend to be price elastic.
D.
demand would tend to be price inelastic.
E.
none of the above is true.
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