外径千分尺的测量精度可达到0.01mm。

He feels it dangerous for a girl to be out late at night, so he won’t have his daughter _______ home late.

A．arrive

B．arriving

C．toarrive

D．arrived

如图所示的电路中，电源电压不变，当滑动变阻器的滑片从左往右移动时，滑动变阻器接入电路的电阻 _________ ，电流表的示数 _________ （选填“变大”“变小”或“不变”）

It is the first time I _____ visitors since I moved to London.[ ]

A. had had        

B. have had        

C. have            

D. had

抑制甲状腺球蛋白的水解酶而减少甲状腺激素分泌的药物是

A．甲硫氧嘧啶

B．碘化钾

C．卡比马唑(甲亢平)

D．¹³¹I

E．以上均不是

MRI能比CT更敏感地发现隐匿骨折，更清晰地显示软组织及脊髓的损伤。