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【单选题】
下列化合物酸性大小顺序不正确的是( )A.
H 3 PO 4 < H 2 SO 4 < HClO 4
B.
HClO < HClO 3 < HClO 4
C.
HI > HBr > HCl
D.
HClO < HBrO < HIO
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举一反三
【单选题】有研究表明,《江南style》之所以受到很多人都喜欢并风靡世界原因之一,就是与一种叫做耳朵虫的大脑神经运动有关。耳朵虫是一种认知瘙痒,《江南style》中那种不断重复的旋律会刺激人脑某个部位的非常规反应,使人不断注意这些音乐,这表明
A.
意识是人脑的机能
B.
意识是对客观存在的反映
C.
意识具有相对独立性。
D.
意识对人体生理活动具有调节作用。
【多选题】关于风对飞行影响的描述,对的有
A.
当侧风的风速大过一定速度时，飞机则不能起降
B.
在巡航时，飞行员都会力争在有利的风向高度上飞行
C.
对低速飞机和高速飞机而言，飞行员需要考虑风的影响的阶段均为起飞着陆阶段
D.
起落过程地面阶段风将影响到飞机的空速，从而影响到飞机的升力和操纵，严重时还将造成事故
【单选题】He has two sons. They are Jim and Tom. Jim is Tom’s brother.
A.
old
B.
older
C.
elder
D.
young
【单选题】2 He has two sons, and _____ are college students.
A.
both of which
B.
both of whom
C.
both of them
D.
both of it
【单选题】Mr. White has two sons and each of them has a sister .how many children does he have ?
A.
one
B.
two
C.
three
D.
four
【单选题】Block group contains .
A.
connecting rods, crankshaft and flywheel
B.
pistons, connecting rods and oil pan
C.
cylinder block, cylinder head and oil pan
D.
piston rings, gasket and connecting rods
【单选题】He has two sons, and _____ are college students.
A.
both of which
B.
both of whom
C.
both of them
【单选题】He has two sons, and _____ are college students.
A.
both of which
B.
both of whom
C.
both of them
D.
both of it
【单选题】Block group contains______.
A.
connecting rod, crankshaft and flywheel
B.
pistons, connecting rods and oil pan
C.
cylinder block, cylinder head and oil pan
D.
piston rings, gasket and connecting rods
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