【单选题】______to the sun for too long, I think, can hurt your skin.
【单选题】__________ yourself to sunlight for too much time will do harm to your skin.
【单选题】下列关于细胞分裂和细胞分化的描述中,正确的是( )
B.
青蛙个体发育:受精卵→蝌蚪→幼蛙→成蛙过程中只有细胞分裂而没有分化
C.
芽的生长点细胞分裂时,首先进行分裂的是细胞质
D.
细胞分裂导致细胞内遗传物质发生改变,分化的细胞遗传物质不发生变化
【判断题】利用离车式车轮动平衡机检测车轮动平衡时,必须将测得的轮辋直径、轮辋宽度和轮辋边缘至平衡机机箱的距离输入电脑。
【简答题】Before the 1970s people normally used cash to buy things, and women couldn't even borrow money on their own. But today it's the norm to have a credit card, and it's (1) ________ to be in debt. What's ...
【判断题】对于大量列表的连接, extend() 方法比运算符 + 具有更高的效率。