【单选题】Jack gave me a note while I _____ in class. [ ]
【简答题】PaCO 2 原发性减少可见于____,PaCO 2 继发性减少可见于____。
【单选题】It is important to note that a reading of 4 indicates an earthquake ______ with a reading of 3.
A.
ten times as strong as one
B.
as strong as one ten times
C.
ten times as strong as that
D.
as strong as that ten times
【单选题】PaCO 2 继发性减少可见于下列哪种情况
【多选题】在使用电子工程的常用符号时下列有关规定说法正确的是()。