Paragraph 1 Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegeta
已知点A(1,﹣3)关于x轴的对称点A'在反比例函数y=的图象上,则实数k的值为( ) A.3 B. C.﹣3
—My mother is a full-time tour guide but she dislikes traveling much. —. A. So is my mother B. Neither does my mother
香港最大的进出口贸易伙伴是( ) A.英国 B.美国 C.祖国大陆 D.澳门
分子式为C4H9Cl的同分异构体有 A.1种 B.2种 C.3种
葛朗台有一句“名言”:“人生就是一件交易”,这句话反映了他具有怎样的性格特点?
如图所示的电路中,当变阻器R3的滑动触头P向b端移动时A、电压表示数变大,电流表示数变小 B、电压表示数变小,电流表示数变大C、电源消耗的功率
在原子中,下列等式不一定正确的是( ) A.质子数=核外电子数 B.质子数=中子数 C.核电荷数=质子数D.核外电子数=核电荷数