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第1题

15、 改进欧拉法的局部截断误差阶是( )。 A.o(h) B.o(h2) C.o(h3) D o(h4)
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第2题

Mrs. Brown is supposed ______ for Italy last week. A. to have left B. to leave C. to be leaving D. to have been left
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第3题

Scientists have tried many ways to prevent the nuclear reactions from ______ harmful and dangerous radiation. A. giving
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第4题

Since the reform, the country’s economy has been fairly _______. A. healthful B. healthy C. well D. health
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