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变价金属化合物中具有催化活性的通常是（）价态的化合物（填“高”或“低”）。
按风险影响的程度不同，政治风险可分为（）。
Passage 1 What is apartheid? It is the policy of keeping African inferior, and separate 1 Europeans. They are to be kept separate by not being allowed to live 2 citizens with rights in European towns. They may go to European towns to work, 3 they may not have their families there; they 4 live in “Bantustans”, the native areas. They are not to mix 5 Europeans by sitting in the same cafes, waiting 6 , compartments of trains, seats in parks, etc. Twelve percent of the land is left for the Africans to live and farm 7 , and this is mostly dry, poor, mountainous land. Yet the Africans are three-quarters of the people. They are forced to go and work 8 the Europeans, not only because their lands do not grow 9 food to keep them, but 10 because they must earn money to pay their taxes. Each adult African man has to pay 1 pound a year poll tax, and ten shillings a year tax for his hut. When they go into European areas to work, they are 11 allowed to do skilled 15 work; they are hewers of wood and drawers of water, and their wage is about one-seventh of __12__ a European would earn for the same kind of work. If a European 13 an African to do skilled work of the kind, reserved for 14 , such as carpentry, both the European and his African employee may be fined 100 pounds. Any African who 15 part in a strike may be fined 500 pounds, and/or sent to prison for three years.
在妊娠28周内，胎漏、胎动不安相当于西医的（ ）。
自动扶梯一般适用于（）等人流量大的场所，是建筑物层间连续运输效率最高的载客设备。
属于重力式桥墩特点的是（）。
注意的现象可以分为哪几种？（）
2013年7月1日，甲事业单位以银行存款购入5年期国债200000元，年利率为5%，按年分期付息，到期还本，付息日为每年7月1日，最后一年偿还本金并付最后一次利息。要求：根据上述资料，不考虑其他因素，分析回答下列第（1）-（4）题。根据上述资料，甲事业单位2013年4月30日国库券到期时的会计处理中，正确的是（）。
根据工程特点，不同的建筑物，失事的主要原因不尽相同，下列选项中属于水工隧洞事故产生的主要原因是（）
买卖合同的结算方式应遵守《中国人民银行结算办法》的规定，除法律或者行政法规另有规定以外，必须通过()，当事人对结算方式应当明确约定。