关于质点的运动,下列说法中正确的是[ ] A. 某时刻速度为零,则此时刻加速度一

题型:选择题

问题:

关于质点的运动,下列说法中正确的是[ ]

A. 某时刻速度为零,则此时刻加速度一定为零

B. 当质点的加速度逐渐减小时,其速度一定会逐渐减小

C. 加速度很小,其速度一定很小

D. 做匀变速直线运动的物体其加速度一定是恒定的

考点:匀变速直线运动加速度和速度的关系
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The question of what children learn and how they should learn it is continually being debated and redebated. Nobody dares any longer to defend the old system, the learning of lessons parrot-fashion and the grammar with-a-whip system, which was good enough for our grandparents. The theorists of modem psychology have stepped in to argue that we must understand the needs of children. Children are not just small adults; they are children who must be respected as such.
Well, you may say, this is as it should be, and a good idea. But think further. What happens "Education" becomes the responsibility not of teachers, but of psychologists. What happens then Teachers worry too much about the psychological implications of their lessons, and forget about the subjects themselves. If a child dislikes a lesson, the teacher feels that it is his fault, not the child’s. So teachers worry whether history is "relevant" to modem young children. And do they dare to recount stories about violent battles Or will this make the children themselves violent Can they tell their classes about children of different races, or will this encourage racial hatred Why teach children to write grammatical sentences Verbal expression is better. Sums Arithmetic No, no; real-life mathematical situations are more understandable.
You see you can go too far. Influenced by educational theorists, who have nothing better to do than write books about their ideas, teachers leave their teacher-training colleges filled with grand, psychological ideas about children and their needs. They make elaborate, sophisticated preparations and try out their "modem methods" on the long-suffering children. Since one "modem method" rapidly replaces another, the poor kids will have had a good bellyful by the time they leave school. Frequently the modem methods are so sophisticated that they fail to be understood by the teachers, let alone the children; even more often, the relaxed discipline, so essential for the "informal" feeling the class must have, prevents all but a handful of children from learning anything.

What do the modem psychologists maintain

A.Children must be understood and respected.

B.Children are small adults and know what they need.

C.Children are better off without learning lessons.

D.Education of children is the responsibility of psychologists.

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下列计算参考剂量的公式中,误差最小的是()

A.RfD=BMD/UF×MF

B.RfD=UF×MF/BMD

C.RfD=LOAEL/UF×MF

D.RfD=UF×MF/NOAEL

E.RfD=NOAEL/UF×MF

题型:选择题

患者刘某,平素情绪不畅,二天前生气后出现胁肋胀痛,走窜不定,胸闷喜太息,纳食减少,嗳气频作,舌苔薄白,脉弦。若此病例证见恶心呕吐,治宜加用()

A.健脾止泻药

B.健脾和胃药

C.和胃止呕药

D.芳香化湿药

E.消食导滞药

题型:选择题

党的领导主要表现在()领导。

A、政治

B、文化

C、组织

D、思想

题型:选择题

同出一物,性味、归经、功效相同的药物是()

A.橘皮

B.青皮

C.枳实

D.枳壳

E.佛手

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