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【简答题】
在“观察水的沸腾”实验中,当水温升到90℃时,小名同学开始记时,每隔1min记录一次水的温度,有关记录数据如下: 时间/min 0 1 2 3 4 5 6 7 8 9 温度/℃ 90 92 94 96 97 98 99 99 94 99 (1)请根据记录的数据在图一中先描点,再用平滑的曲线画出水的沸腾图象. (2)如图二(甲)为某同学测“沸水温度”实验时的情形.由于操作错误,他观察到水沸腾时,温度计的示数大于100℃,他的错误是______.纠正错误后,他观察到水沸腾时,如图二(乙)所示,温度计的读数低于100℃的原因可能是______. (3)由图象可以看出,把90℃加热到刚开始沸腾所需时间为______min.沸腾后,若继续对水加热,则加热过程中温度将______.
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举一反三
【单选题】低钾血症的表现是()
A.
惊厥
B.
腱反射亢进
C.
手足搐搦
D.
震颤
E.
肌肉的收缩性降低
【单选题】内毒素的毒性成分主要是 ( )
A.
特异性多糖
B.
脂多糖
C.
核心多糖
D.
脂质A
E.
脂蛋白
【单选题】?Read the article below about the difficulties of managing a small business, and the questions on the opposite page. ?For each question 13—18, mark one letter (A, B, C, or D) on your Answer Sheet for ...
A.
It is wrong to assume that they are different from other managers.
B.
The problems they have to cope with are specific to small businesses.
C.
They find it difficult to attract staffs with sufficient expertise.
D.
They could learn from the organizational skills of managers in large companies.
【单选题】?Read the following article about a British businessman and the questions. ?For each question (15-20), mark one letter (A, B, C o r D) on your Answer Sheet. George Kamp is the kind of tough English no...
A.
He has problems with management.
B.
Another company wants to gain control of it.
C.
He is looking for new advisers to help run it.
D.
There have been complaints about his management style.
【单选题】炭疽杆菌之所以能引起美国人的恐慌,主要原因之一是能产生两种成分的蛋白质内毒素。有的科学家将该菌的大型DNA分子破坏,该菌仍然能产生内毒素。请分析推断,应该再破坏该菌的什么结构,才能使它从根本上不再产生内毒素( )
A.
核糖体
B.
细胞核
C.
质粒
D.
内质网
【单选题】女性患儿, 2 岁,因呼吸困难给予氧疗,合适的给氧方法是
A.
鼻导管法
B.
鼻塞法
C.
面罩法
D.
氧气枕法
E.
头罩法
【单选题】Some students lose marks in reading comprehension (阅读理解) _____ because they don't read the question carefully. [     ]
A.
nearly
B.
simply
C.
hardly
D.
almost
【单选题】有人这样评价商鞅及其变法 , “商鞅可以称为中国历史上第一个真正彻底的改革家 , 他的改革不仅限于当时 , 更影响了中国数千年 ” 。 下列关于商鞅变法对中国历史发展影响的叙述 , 正确的是 1客观上有利于中国结束分裂 , 走向统一 2重农抑商政策成为后世奉行的基本经济政策 3专制主义中央集权制度大行于世 4对人民实行从精神到肉体的严格控制 , 成为后世帝王的统治原则
A.
①②③④
B.
①②④
C.
③④
D.
①②③
【判断题】scale表示手指捏合,如果它的值大于1代表两个手指之间的距离变小。
A.
正确
B.
错误
【单选题】•Read the following passage below about a Chairman's Statement. •For each question (23-28), choose the correct answer. •Mark one letter (A, B or C) on your Answer sheet. CHAIRMAN'S STATEMENT Despite t...
A.
It laced increased competition.
B.
It wanted to enter new markets.
C.
It initiated a policy of expansion.
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