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【多选题】
以下描述正确的有哪些?( )A.
镜头的速度是指特定的镜头在特定的时间内所能传送的光量。
B.
镜头加膜的作用：可减少镜头表面的反射光的损失，增大光线的通过率。
C.
可更换镜头的照相机，其镜头可以取下来并更换上其他的镜头。
D.
光圈数值越大，光越大。
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【单选题】It is _________ in October, but it is even _________ in November.
A.
cold，cold
B.
cold，colder
C.
colder，cold
D.
colder，coldest
【简答题】These wild flowers are so special that I would do__________I can to save them. A．whatever B．which C．that D．whichever
【简答题】This happened in London It was November and the weather was very wet and cold. A Frenchman had caught a very bad cold. He coughed day and night, so he decided to go and get some medicine for his cough...
【简答题】In November a cold unseen stranger, ________________(被医生叫做肺炎), walks about the colony, touching one here and there with his icy fingers.
【单选题】It ________ be really cold in November in Hefei though we usually have warm and sunny days. [ ]
A.
should
B.
will
C.
must
D.
can
【简答题】已知电路如图a所示，R=1.5kΩ，L=15H，U S =18V，换路前，电路已处于稳态。t=0时，S开关闭合，试求i L 、u L ，并画出其波形。
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