A:独立自主、自力更生原则
B:平等互利原则
C:利益最大化原则
D:贸易平衡原则
用显微镜观察人口腔上皮细胞时,将光线调得越亮越好.(判断对错)
There are only ________ new words in the book, but I know _______ of them.
用绳拴住木棒AB的A端,使木棒在竖直方向上静止不动.在木棒A端正下方有一点C距A端0.8m.若把绳轻轻剪断,测得A、B两端通过C点的时间差是0.2s.重力加速度g=10m/s2,求:
They often cook Chinese food on the weekend.