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
He left the place, ______ never ______ back again. [ ]
A. determined; to come
B. being determined; to come
C. detetmined; coming
D. determining; to come
螺纹中径是指螺纹大径和小径的平均值。
