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【简答题】
物质的定量分析技术可分为 和 。
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【单选题】听力原文：M: Jeff has not been on good terms with his sister for the last few years, but I hear he visited her on his trip to California recently. W: Yes, he hadn't planned to call on her, but he changed h...
A.
Jeff has always liked his sister.
B.
Jeff made a phone call to-his sister.
C.
Jeff visited his sister.
D.
Jeff planned to visit his sister.
【简答题】电路如图14．35所示。开关S闭合前电路已达稳态。t=0时闭合开关S，用拉普拉斯变换法求电压uc(t)。
【简答题】电路如图所示。t＜0时电路处于稳态，t=0时开关S闭合。求S闭合后的电压u(t)。
【单选题】Sam has curly hair but his twin sister’s is quite ().
A.
even
B.
straight
C.
uneven
D.
regular
【单选题】His sister _____ to the hospital. She will be back _____ half an hour. [ ]
A.
has gone; after
B.
has been; in
C.
has gone; in
D.
has been; after
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