若欲单视角观察心动周期,常采用:()
A.2D-TOF
B.3D-TOF
C.2D-PC
D.3D-PC
E.黑血法
参考答案:C
根据实际情况回答下列问题.
1. What do you think of the sunglasses?
2. What does your mother think of the sunglasses?
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挖掘出的电缆或接头盒,如下面需要挖空时,应采取悬吊保护措施。电缆悬吊必须每1m吊一道。