局部腐蚀危险性最大的是()。
(A)溃疡腐蚀
(B)点状腐蚀
(C)晶间腐蚀
参考答案:C
I have worked with him for some time and have found that he is ________ than Jim.
A.more efficiently a worker
B.a more efficient worker
C.more an efficient worker
D.a worker more efficient
成人心肺复苏进行胸外按压的频率是()
A.80次/分
B.100次/分
C.120次/分
D.140次/分