根据AC-121-65的规定,腐蚀预防与控制大纲中应当至少包括的内容有()。
A.航线腐蚀预防与维护
B.腐蚀检查任务与区域
C.腐蚀等级的确定
D.其余全部
参考答案:D
—I had invented many new things____ last year.
—Congratulations. I was supposed to learn from you. [ ]
A. at the time of
B. by the time of
C. in time of
下面一组图像主要显示()
A.正常的右侧冠状动脉
B.正常的左前降支
C.右侧冠状动脉钙化
D.左前降支钙化
E.左旋支钙化