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Which of the following is the best version of sentence 2 (reproduced below)?The medical community doesn't know the cause, has difficulty diagnosing it, and it is hard to test.
血吸虫的中间宿主是()
阴部内动脉的分支有()
甲状腺手术后最危险的并发症是()
预备航次(),合同中有关出租人权利义务的规定()。
一般选择自然因素作为耕地分等的评价指标,而选择经济因素作为定级的评价指标。
空调系统冷却水检测允许偏应满足怎样的条件?()
股票指数期货和股票期货的合约标的物是相同的。()
最常用、基本的药量计算方法是( )。
当工作照明发生故障时,为保障人员疏散,需要安装事故照明,事故照明的投入是()的