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单项选择题
Hawaii's landscape varies but is dominated by ________ topography.( ) A. arctic B. tropical C. deserted D. volcanic
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未知题型
把60g质量分数为50%的NaCl溶液提高10%,可用的方法是__________.
多项选择题
After calculating the total amount. The hotel clerk would tell the guest how much money he or she can get after exchanging. He/she can say:
A.That’s a total of ¥3602.5.
B.That makes a total of ¥3602.5.
C.It's a total of ¥3602.5.
D.That makes a totally of ¥3602.5.
未知题型
图6—24是弹簧振子的振动图像,试回答下列问题:
(1)振动的振幅、周期、频率各是多少
(2)如果从0点算起,到图线上哪一点为止振子完成了一次全振动从A点算起呢
(3)从0到1.6 s时间内,哪些点的动能最大哪些点的势能最大
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