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【单选题】
以下哪项不是培养细胞一代生存期中的阶段
A.
潜伏期
B.
指数生长期
C.
停滞期
D.
传代期
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皮皮学刷刷变学霸
举一反三
【单选题】古人洗衣服时,一般使用()浸泡的溶液,其中含有碳酸钾,能去污。
A.
碳酸钠
B.
豆粉
C.
香樟叶
D.
草木灰
【简答题】实验室里,欲从草木灰中除去不溶性的固体杂质来提取固体碳酸钾. (1)此实验操作顺序为①称量样品;②溶解、沉淀;③______;④______. (2)用托盘天平称量样品时,若指针偏向右边,则表示______. A、左盘重、样品轻B、左盘轻、砝码重 C、右盘重,砝码轻D、右盘轻、样品重 (3)第③步操作,有时可能重复进行,这是由于______. (4)在进行第四步操作时,要用玻璃棒不断小心搅拌液体,...
【单选题】墨子有言:“志不强者智不达”,这句话的含义是( )
A.
立志当高远
B.
立志做大事
C.
立志当躬行
D.
立志当尽早
【单选题】According to the reading passage, the Internet is enabling collaboration through crowdsourcing. How does it work?
A.
a. A small group of people connected to the Internet work together on a project.
B.
b. A large group of people connected to the Internet contribute toward a shared goal.
【简答题】I was just coming out ofthe sea after a swim __________ I stepped on a sharp stone and cut my foot. [A]as[B]when[C]than[D]before
【简答题】在生产生活中,你会发现“化学就在身边”. (1)纯碱能去除油污,这是因为它的水溶液pH值______7(填“>”或“<”). (2)上海世博园内安装的“直饮水”机,采用“活性炭+超滤层+紫外线”净水工艺.活性炭在此起______作用,净化后的水属于______(选填“混合物”或“纯净物”). (3)在农业生产中,施用的草木灰(有效成份为K 2 CO 3 )属于______肥,它的焰色反应火焰呈__...
【单选题】化学与社会、生活密切相关。对下列现象或事实的解释正确的是 选项 现象或事实 解释
A.
用热的烧碱溶液洗去油污 Na 2 CO 3 可直接和油污反应
B.
漂白粉在空气中久置变质 漂白粉中的CaCl 2 与空气中的CO 2 反应生成CaCO 3
C.
施肥时,草木灰(有效成分为K 2 CO 3 )不能与NH 4 Cl混合使用 K 2 CO 3 与NH 4 Cl反应生成氨气会降低肥效
D.
FeCl 3 溶液可用于铜质印刷线路板制作 FeCl 3 能从含有Cu 2 + 的溶液中置换出铜
【单选题】A shortage results whe
A.
a binding price ceiling is imposed.
B.
a binding price floor is imposed.
C.
a price ceiling is imposed but it is not binding.
D.
a price floor is imposed but it is not binding.
【单选题】The __________ question for him is to ________ whether bees could tell each other the exact position of a feeding place.
A.
remaining find out
B.
remained find out
C.
remaining find 
D.
remained look for
【判断题】Crowdsourcing is where a group of people voluntarily performs tasks that were traditionally completed by a firm's employees.
A.
正确
B.
错误
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