慢速手机不间断切割牙体组织对牙髓损害的因素是（）。 A.干燥脱水 B.粉尘污染

Although the working mother is very  busy, she still ____   a lot of time to her children  [ ]

A. devotes    

B. spends  

C. offers    

D. provides

The man ______ was a friend of mine．

A．you just talked to

B．whom you just talked to him

C．who you just talked to him

D．which you just talked to

为避免或减少肝脏的首过作用，肛门栓应塞入距肛门处（）

A.2cm

B.4cm

C.6cm

D.8cm

E.10cm

栓剂中作基质（）

A．氟里昂

B．月桂氮草酮

C．可可豆脂

D．硝酸苯汞

E．硬脂酸镁

使用非安全电压的手电钻、冲击钻、手提式角磨机时，应戴好（），并站在绝缘橡皮垫上。在钻孔或磨削时应保持用力均匀，严禁用手触摸转动的钻头和砂轮片。