下列操作中,不正确的是 A.用胶头滴管向试管中滴加液体时,把滴管伸入试管内 B.

题型:选择题

问题:

下列操作中,不正确的是

A.用胶头滴管向试管中滴加液体时,把滴管伸入试管内

B.把氢氧化钠固体放在天平左盘的玻璃器皿中称量

C.在实验室里制取CO2气体时,应先检查装置气密性

D.浓硫酸沾到皮肤上,要立即用大量水冲洗,再涂上3%~5%的碳酸氢钠溶液

考点:测容器—量筒称量器—天平加热器皿—酒精灯常见仪器和装置的用途
题型:选择题

用绳AC和BC吊起一重物处于静止状态,如图所示. AC绳与竖直方向夹角37°,BC绳与竖直方向夹角为53°,g取10 m/s2,sin37°=0.6,sin53°=0.8

求:(1)当所挂重物质量为4kg时,两绳子所受拉力多大?

(2)若AC能承受的最大拉力为50N,BC能承受的最大拉力为40N,为使两绳不断,则所挂物体质量不能超过多少?

题型:选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

The third paragraph describes the ________of aspirin.

A.uses

B.value

C.effects

D.history

题型:选择题

设备大修是指修理费用超过原设备价值()和需要更换重要部件的修理。

A、20%

B、30%

C、40%

D、50%

题型:选择题

在弱氨溶液中的氰化物(KCN或NaCN)是很好的掩蔽剂,许多金属的氰络合物要比双硫腙络合物稳定。氰化物络合的金属是()

A.Cd

B.Pb

C.Bi

D.Fe

E.Ti

题型:选择题

(二) 要求:(1)根据下列资料的先后顺序作相关的帐务处理(2)计算当期应纳的各流转税及附加,并作相关计提、缴纳税金的帐务处理。(计算结果以元为单位,保留小数点后两位) 资料:滨海酒厂系某市中型国有企业,被主管税务机关认定为增值税一般纳税人, 2005年3月份生产一种类型的滋补药酒,当期有关的增值税抵扣凭证全部经税务机关认证。有关经济业务资料如下:1.从A农场收购薯干一批,开具主管税务机关核准使用的收购凭证上注明收购金额为100,000元,数量为100吨。取得承运部门开具的运费发票上注明运费8000元,装卸费,保险费为2000元。上述款项均付,薯干已验收入库。2.从A农场收购的40吨薯干发往本市甲酒厂,委托加工成薯类白酒,双方签署委托加工合同一份,载明由滨海酒厂提供主要原料薯干40吨,成本价为38576元;由甲酒厂,代垫部分辅料,收取加工费(含辅料款)30,000元,税金5100元,并开具增值税专用发票。已经甲酒厂无同类产品价格可供参考。3.将委托甲酒加:正完的5吨薯类白酒全部收回,已全部支付加工费及相关税费,薯类白酒期初无库存,收回后60%用于勾兑生产药酒,10%销售给某个体餐厅,取得含税收入12500元已送存银行,其余30%待发后生产药酒。4.当月制成的4吨药酒生产成本为160,000元,又验收入库,其中70%对外销售,取得含税收入198,900元,已送存银行。5.本月将300公斤生产成本为12,000药酒分别赠送给本市各药店。6.本月外购包装物,取得增值税专用发票注明价款100,000元,税金17,000元,包装物已验收入库,但款项尚未支付7.“应交税金-未交增值税”2005年2月28日贷方余额为20,000元,系企业2004年 12月份所属增值税欠税款,已报经税务机关批准延缓纳税

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