— John, how did your English exam go? — I thought I _____, but in fact I came in the top 10% in the class. A. should have failed B
下列关于“过氧化氢”的说法正确的是 A.过氧化氢具有杀菌消毒作用,是强酸 B.过氧化氢是离子化合物 C.过氧化氢可以发生分解反应 D.过氧化氢是水的
阿里山纪行(片段)(共14分) 不到阿里山,何以能说到了台湾?这倒不尽然是看那“美如水”的“阿里山姑娘”。从台北松山机场搭机,仅四十分钟
下列词语书写完全正确的一项是 ( ) A.翡 翠 一反即往 相得益彰 群蚁排衙 B.蹂 躏
She devoted herself ______ to her research and it earned her agood reputation in her field.A.stronglyB.extremelyC.entirelyD.freely
Below is a selection from a popular science book. If blood is red,why are veins(静脉) blue? Actually,veins are not blue at all. They are more of a clear,yellowish colour. Although blood
已知25℃时有关弱酸的电离平衡常数: 弱酸化学式CH3COOHHCNH2CO3 电离平衡常数(25℃)1.8×l0_54.9×l0_10K1 = 4.3×l0_7 K2 = 5.6×l0_11 现维持25℃,下
(12分)学校要开运动会,几个同学讨论怎样才能将铅球掷得更远。陈平说:“掷出点越高,掷得越远”。王力说:“掷出速度越大,掷得越远”。李明