September is the ______ month of the year. A. nine B. ninth C. ten D. tenth
小红在使用显微镜过程中,发现目镜上沾有污物,她应选用( )擦拭镜头。A.擦镜纸B.纱布C.纸巾D.作业纸
一只脚踩在钉子上,马上引起腿的收缩以避开损伤性刺激的继续作用,而另一条腿迅速伸直以支持身体,使身体不会跌倒。右图表示这一复杂反射的过
过氧化钠(Na2O2)与水发生反应,生成对应的碱和氧气,化学方程式为2Na2O2+2H2O4NaOH+O2↑。现将78 g过氧化钠放入338 g水中,充分反应。试计算: (1)生成
情绪是多姿多彩的。情绪的基本类型是A.喜、忧、哀、乐B.喜、怒、哀、惧 C.喜、悲、愤、乐D.悲、喜、忧、愤
Please ________the text and then answer my questions. A. look for B. look in C. look through D. look on
下列关于催化剂的叙述中,正确的是 ( ) A.能加快化学反应速率
—What do you think of their new house? —It’s very modern,but they have some antique________ in it. A.furniture B.furnit