皮皮学,免费搜题
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【单选题】
除了6块听小骨,人有()块骨。
A.
100
B.
200
C.
300
D.
400
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【判断题】冼星海的小提琴组曲《西藏音诗》是中国第一部以西藏为题材的器乐作品。
A.
正确
B.
错误
【单选题】The first subject in this sentence is "therapist." What is the second subject in this sentence? 5. The therapist told him that carefully following the therapy plan is the key to recovery.
A.
him
B.
carefully
C.
following
D.
key
【简答题】He was like a cock who thought the sun had risen to hear him crow. This sentence is ( ). He chse a gun instead of a cap and gown. This sentence is ( ). Mark Twain is a mirror of Americ...
【单选题】常温下,某溶液pH=4,则下列说法正确的是( )。
A.
该溶液一定呈酸性
B.
该溶液一定呈碱性
C.
该溶液中【OH-】为1×10-14
D.
该溶液中【H+】为1×10-14
【单选题】This sentence is difficult to understand.Can you make of it?
A.
idea
B.
knowledge
C.
sense
D.
understanding
【单选题】The first subject in this sentence is "therapist." What is the second subject in this sentence? The therapist told him that carefully following the therapy plan is the key to recovery.
A.
him
B.
carefully
C.
following
D.
key
【单选题】This sentence is difficult to understand.Can you make         of it?
A.
sense
B.
knowledge
C.
idea
D.
understanding
【单选题】下列说法正确的是 [     ]
A.
t ℃ 时,某溶液pH=6,则该溶液一定为酸性
B.
常温下,将pH=11的氨水稀释后,溶液中所有离子的浓度均降低
C.
常温下,将pH=11的NaOH溶液和pH=3的HCl溶液等体积混合后,溶液pH=7
D.
常温下,物质的量浓度和体积相同的Na 2 CO 3 、Na 2 SO 4 、HCl 溶液混合后,pH<7< /div>
【单选题】下列说法正确的是 [     ]
A.
t ℃ 时,某溶液pH=6,则该溶液一定为酸性
B.
常温下,将pH=11的氨水稀释后,溶液中所有离子的浓度均降低
C.
常温下,将pH=11的NaOH溶液和pH=3的CH 3 COOH溶 液等体积混合后,溶液的pH <7< /div>
D.
常温下,物质的量浓度和体积相同的Na 2 CO 3 、Na 2 SO 4 、HCl 溶液混合后,pH<7< /div>
【单选题】下列说法正确的是?
A.
人走路时,只有地对脚的反作用力大于脚蹬地的作用力时,人才能往前走
B.
以卵击石,石头没损伤而鸡蛋碎了,是因为鸡蛋对石头的作用力小于石头对鸡蛋的的作用力
C.
用锤子钉钉子,因为锤头的质量大于钉子的质量,所以锤头对钉子的作用力大于钉子对锤头的作用力
D.
火箭飞行是靠它内部的燃料猛烈燃烧所产生的气体从尾部喷出去,这些气体对火箭产生了反作用力
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