对病毒性心肌炎最有诊断价值的检查是
A．超声心动图B．血清病毒中和抗体滴度C．心电图D．心音图E．胸片
参考答案：B
— Happy Teachers' Day!
— _____________________[ ]
A. Thank you.
B. OK.
C. Happy Teachers' Day!
筒压法检测砖砌体中砌筑砂浆强度，在每一测区，应从距墙表面（）以里的水平灰缝中凿取砂浆约4000g.
A.5mm
B.10mm
C.15mm
D.20mm
