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简述利用光温敏核不育系配制杂交种的原理和方法。

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超声波检验中，选用晶片尺寸大的探头的优点是（）

A. 曲面探伤时减少耦合损失
B. 减少材质衰减损失
C. 辐射声能大且能量集中
D. 以上都对

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上牙槽后神经阻滞麻醉注射法，注射针与上颌牙的长轴成45°，向何方向刺入，进针时针尖沿着上颌结节弧形表面滑动，深约2mm（）

A. 上后外
B. 上前内
C. 上后内
D. 上前外
E. 平后内

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Devin， a user on your Windows 2000 network， complains that when he tries logging on locally to his Windows 2000 Professional computer an error message is displayed. ‘The local Policy of this Computer does not allow interactive logons’ Devin is sure that he has used the correct username and password. What is the most likely cause of this problem？（）

A. The local user account is disabled.
B. The logon rights have been modified.
C. The local user account password is case-sensitive.
D. The local user account username is incorrect.

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什么是工频交流耐压试验？

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