判断下列说法中哪些是不正确的是( ) A.大小均为10N的两个力,它们的合力始终

题型:选择题

问题:

判断下列说法中哪些是不正确的是(  )

A.大小均为10N的两个力,它们的合力始终为零

B.力是改变物体运动状态的原因

C.物体在平衡力作用下,运动状态不会改变

D.牛顿第一定律是以实验事实为基础,通过推理、想象而总结出来的

考点:力的合成与应用物体运动状态的变化
题型:选择题

产后血循环系统生理变化正常的是()。

A.妊娠血容量产后1~2周恢复未孕状态

B.产褥早期血液仍处于高凝状态

C.白细胞总数在产褥早期即下降

D.红细胞沉降率于产后2周恢复正常

题型:选择题

将下列相关内容用线连接起来。(每线1分,共12分)

a. 男性生殖系统     A 子宫           ①产生卵细胞

B 睾丸           ②是胚胎和胎儿发育的场所

C 输卵管         ③分泌雄性激素

b. 女性生殖系统     D 卵巢           ④输送生殖细胞

E * *            ⑤是精子进入和胎儿产出的通道

F 输精管

题型:选择题

需要进行FK的骨骼装配,可能用到哪几种约束?()

A.point

B.Pole vector

C.orient

D.parent

题型:选择题

①实现了粮食供应从长期短缺到总量基本平衡、丰年有余的历史性转变
②以占世界7%的耕地养活了占世界22%的人口
③使粮食产量不断攀升
④坚持以自力更生为主的粮食安全战略
⑤推广良种、改善水利条件、精耕细作
⑥在上个世纪末突破5亿吨大关
将以上6个句子重新排列,语序正确的是( )。

A.④⑥②⑤③①
B.④⑤③⑥①②
C.⑤①⑥④③②
D.⑤④③⑥②①

题型:选择题

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never-ending flood of words.
In (36) a job or advancing in one, the ability to read and comprehend (37) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (38) readers.
Most of us develop poor reading (39) at an early age, and never get over them. The main deficiency (40) in the actual stuff of language itself—words. Taken individually, words have (41) meaning until they are strung together into phrases, sentences and para-graphs. (42) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (43) words or passages.
Regression, the tendency to look back over (44) you have just read, is a common bad habit in reading. Another habit which (45) down the speed of reading is vocalization—sounding each word either orally or mentally as (46) reads. To overcome these bad habits, some reading clinics use a device called an (47) , which moves a bar (or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (48) the reader finds comfortable, in order to "stretch" him.
The accelerator forces the reader to read fast, (49) word-by-word reading, regression and sub vocalization, practically impossible. At first (50) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (51) your comprehension will improve.
Many people have found (52) reading skill drastically improved after some training. (53) Charlce Au, a business manager, for instance, his reading rate was a reasonably good 172 words a minute (54) the training, now it is an excellent 1,378 words a minute. He is delighted that how he can (55) a lot more reading material in a short period of time.

[A] master[B] go over [C] present [D] get through

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