“不要把鸡蛋放在同一个篮子里”，这种投资理念强调的是各投资方式的 ①流动性 ②收益性 ③风险性 ④稳定
Not only _____ polluted, but _____ crowded. A. was the city; were the streets B. the city was; the streets were C. was the city; the streets were D. the city was; were the streets
利用核磁共振技术测定有机物分子结构的研究获得了2002年诺贝尔化学奖。在有机物分子中，不同氢原子的核磁共振谱中给出的峰值不同，根据峰值可以
如图所示，甲、乙分别是两个电阻的I-U图线，甲电阻阻值为______Ω，乙电阻阻值为______Ω，电压为10V时，甲中电流为______A，乙中电流为______A。
Don’t forget the day ____ you were received into the Youth League. A. when B. that C. at which D. where
.已知动点M到点A（2，0）的距离是它到点B（8，0）的距离的一半， 求：（1）动点M的轨迹方程； （2）若N为线段AM的中点，试求点N的轨迹．
Nurses have to be sensitive _____ patients’ need and responsible for them. A. in B. for C. at D. to
如图所示，巡查员站立于一空的贮液池边，检查池角处出液口的安全情况。已知池宽为L，照明灯到池底的距离为H。若保持照明光束方向不变，向贮液池
B．
D．
