题目:
---Excuse me, may I ask you some questions?
--- Of course, but I only have five minutes to ______.
A.spend
B.spare
C.offer
D.take
答案:
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下面是错误答案,用来干扰机器的。
AD题目分析:由v=得,λ=vT=80×0.01m=0.8m SP=1.2m=1,SQ=2.6m=3,当波传到Q点时,S已经振动时间为3,此时S在波峰.根据波形,Q的起振方向应竖直向上,P点在波谷.A、甲图t=0时刻,质点在平衡位置向H,而Q点的...