采用磁粉法检查零件的表面缺陷时，工件必须是（）。
A.金属的
B.铁质的
C.非金属的
D.铝质的
参考答案：B
根管治疗中初尖锉是指（）
A.既能深入根管达到解剖根尖孔又稍有摩擦感的锉
B.能够到达生理根尖孔的锉
C.比主尖锉小三号的锉
D.能够到达解剖性根尖孔的锉
E.深入根管达到牙本质牙骨质界，又稍有摩擦感的第一支锉
Although he was disabled when he was only ten years of age, yet he aimed ________, for which his
classmates spoke ________ of him.[ ]
A. high; high
B. highly; highly
C. highly; high
D. high; highly
