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【单选题】
The attitude of the Federal Bureau of Investigation shows that ______.A.
enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members
B.
enough data of DNA samples should be collected to confirm that only DNA samples from the same person can match
C.
enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same person
D.
additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person 61. The National Academy of Sciences holds the stance that ______ .
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【简答题】坝底扬压力包括浮托力和渗透压力两部分，其中（ ）。
【单选题】X6132 型万能铣床主轴启动后,若将快速按钮 ( ) 或 SB6 按下,接通接触器 KM2 线圈电源,接通 YC3 快速离合器,并切断 YC2 进给离合器,工作台按原运动方向作快速移动。
A.
SB3
B.
SB4
C.
SB5
D.
SB2
【单选题】(6分) 执行以下程序段后, x 的值是( )。
A.
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">8
B.
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">12
C.
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">14
D.
16
【单选题】X6132 型万能铣床主轴启动后,若将快速按钮SB,或SB。按下,接通接触器( )线圈电源,接通YC,快速离合器,并切断YC2进给离合器,工作台按原运动方向作快速移动。
A.
KM1
B.
KM2
C.
KM3
D.
KM4
【单选题】实验中需要用温度计测水的温度原因是
A.
水的表面张力系数随温度升高而减小
B.
水的表面张力系数随温度升高而增加
C.
所有实验都必须测出环境温度
D.
以上说法都不对
【简答题】休斯敦和洛杉矶均为美国重要港口，都属于美国东岸航线。
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