皮皮学，免费搜题
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搜题
【单选题】
电阻R 1 =300Ω，R 2 =200Ω，并联后的总电阻为（）A.
150Ω
B.
300Ω
C.
500Ω
D.
120Ω
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I got in touch with Charles ________ I received his letter.
A.
when immdeiately
B.
immediately
C.
soon
D.
suddenly
【单选题】— Have you got in touch with Tom? — Oh, sorry.I couldn't________his phone number at that time. [ ]
A.
think out
B.
think about
C.
think of
D.
think over
【单选题】I got in touch with Charles ________ I received his letter.
A.
when immediately
B.
soon
C.
immediately
D.
suddenly
【简答题】在茎的初生结构中,初生韧皮部的分化方式为_____,先分化的是_____韧皮部,后分化出来的是_____韧皮部,初生木质部的分化方式为_____。
【单选题】I got in touch with Charles ________ I received his letter.
A.
when
B.
soon
C.
immediately
D.
suddenly
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