| The United States {{U}} (56)
{{/U}} a large part of the North American continent. Its neighbors are
Canada {{U}} (57) {{/U}} the north, {{U}} (58) {{/U}} Mexico to
the south. {{U}} (59) {{/U}} the United States is a big country, it’s
not the largest in the world．In 1964 its {{U}} (60) {{/U}} was over
185,000,000. When this land first became a nation, after {{U}} (61) {{/U}} independence from England, it had thirteen states, {{U}} (62) {{/U}} of the states was represented on the American flag by a {{U}} (63) {{/U}} . All the states were in the eastern part of the continent. As the nation grew towards the west, new states were in the eastern part of the continent. As the nation grew towards the west, new states were added and new stars {{U}} (64) {{/U}} on the flag. For a long time, there were 48 states. In 1959, however, two {{U}} A. less B. more C. another D. others [单项选择]维持细胞生命活动必需的管家蛋白是（）
A. 膜蛋白 B. 分泌蛋白 C. 血红蛋白 D. 角蛋白 E. 收缩蛋白 [单选题]所谓拌口馅是指( )。
A.甜馅 B.熟馅 C.咸馅 D.甜馅或咸甜馅 [单选题]消防救援机构取得的下列证据材料中,（ ）可以作为定案依据。
A.经查证属实的违法嫌疑人的陈述 B.以胁迫手段取得的证据材料 C.经当事人技术处理而无法辨明真伪的证据材料 D.以偷拍、偷录、窃听手段获取的证据材料 [多选题]货车运用作业场的作业人员接班后，应对列车技术作业使用的相关（）等进行性能确认，符合要求后方可使用。
A.设施 B.设备 C.系统 D.工具 [单选题]低压涡轮分______级。
A.1 B.2 C.4 D.3 [判断题]锅炉房通向室外的门应向内开 ( )
A.正确 B.错误 [单项选择]回火是在（）处理之后的一种热处理方法。
A. 退火 B. 淬火 C. 正火 D. 氮化 我来回答: 提交
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