容错指()和()发生故障的情况下系统仍然具有继续运行的能力。
参考答案:硬件;软件
His father told me that he __________ for the United States three days __________.
A.has left; ago
B.had left; ago
C.left; ago
D.had left; before
风邪不具有的性质和致病特点是
A.升发开泄
B.耗气伤津
C.善行数变
D.百病之长
E.易袭阳位