电气设备的隔爆外壳失去了耐爆性和不传爆性称为失爆。
参考答案：对
—He thinks that girls are smarter than boys when it comes to learning English.
—But two years ago he thought_______.
A．so
B．otherwise
C．opposite
D．different
腹部可有疼痛性包块伴休克
A．麻痹性肠梗阻B．绞窄性肠梗阻C．血运性肠梗阻D．单纯性肠梗阻E．蛔虫性肠梗阻
