[判断题]( )计算机硬盘出现物理坏道后仍可放心使用。-我要搜题网

[不定项选择题]In 1784, five years before he became president of the United States, George Washington,52, was nearly toothless. So he hired a dentist to transplant nine teeth into his jaw-having extracted them from the mouths of his slaves. That's a far different image from the cherry-tree-chopping George most people remember from their history books. But recently, many historians have begun to focus on the roles slavery played in the lives of the founding generation. They have been spurred in part by DNA evidence made available in 1998, which almost certainly proved Thomas Jefferson had fathered at least one child with his slave Sally Hemings. And only over the past 30 years have scholars examined history from the bottom up. Works of several historians reveal the moral compromises made by the nation's early leaders and the fragile nature of the country's infancy. More significantly, they argue that many of the Founding Fathers knew slavery was wrong-and yet most did little to fight it. More than anything, the historians say, the founders were hampered by the culture of their time. While Washington and Jefferson privately expressed distaste for slavery, they also understood that it was part of the political and economic bedrock of the country they helped to create. For one thing, the South could not afford to part with its slaves. Owning slaves was "like having a large bank account," says Wiencek, author of An Imperfect God: George Washington, His Slaves, and The Creation of America． The southern states would not have signed the Constitution without protections for the "peculiar institution," including a clause that counted a slave as three fifths of a man for purposes of congressional representation. And the statesmen's political lives depended on slavery. The three-fifths formula handed Jefferson his narrow victory in the presidential election of 1800 by inflating the votes of the southern states in the Electoral College. Once in office, Jefferson extended slavery with the Louisiana Purchase in 1803; the new land was carved into 13 states, including three slave states. Still, Jefferson freed Hemings's children-though not Hemings herself or his approximately 150 other slaves. Washington, who had begun to believe that all men were created equal after observing the bravery of the black soldiers during the Revolutionary War, overcame the strong opposition of his relatives to grant his slaves their freedom in his will. Only a decade earlier, such an act would have required legislative approval in Virginia． George Washington's dental surgery is mentioned to__
A.show the primitive medical practice in the past
B.demonstrate the cruelty of slavery in his days
C.stress the role of slaves in the U.S. history
D.reveal some unknown aspect of his life

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[简答题]玻璃是无序网络结构，不可能有滑移系统，呈脆性，但在高温时又能变形，为什么?

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[多选题]为了确保SF6气体在线设备的准确可靠性，可利用(____)对其进行校验工作
A.A、标准气体
B.B、标准湿度发生
C.C、压力校验台
D.D、温度标准表计

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[单项选择]从实际工作看，健康教育工作的重点主要是
A. 信息传播
B. 卫生宣传
C. 行为干预
D. 社会参与
E. 社会动员

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[填空题]公差表示制造精度的要求,反映加工的( )。

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[判断题]319.BM014脱卸正压呼吸器的时候，取下装具，按下供气阀上黄色按钮，将剩余气全部放掉而且必须放掉，直至压力表指针归零。
A.正确
B.错误

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[简答题]请你说说被动吸烟有哪些危害？