问题
选择题
On the table, there _______ some chicken, some rice and some carrots beside the glass of milk. [ ]
A. is
B. am
C. are
D. be
答案
答案：A
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On the table, there _______ some chicken, some rice and some carrots beside the glass of milk. [ ]
A. is
B. am
C. are
D. be
答案：A
轴传播的简谐横波在某时刻的波形图，图中
质点的速度方向向下，波的传播速
度为
，则下列说法中正确的是（ ）
一定在
，质点
在
处