动脉粥样硬化的二维超声表现包括:①动脉内膜增厚;②粥样硬化斑块形成;③溃疡形成;④斑块内出血()
A.①②③
B.①③
C.②④
D.④
E.①②③④
参考答案:E
.----Is the girl ______ is interviewing the headmaster your friend?
----Yes, she is my best friend.
A. whom B. which C.. who
()是冷载体。
A、蒸汽
B、液氨
C、熔盐
D、烟道气