每次使用短接线前无论你能否控制电源开关必须先执行（）程序。
参考答案：断电锁闭/警示
小红座位的西北方是明明，那明明在小红的（ ）方向。
30．It was the training that he had as a child________made him such a good pianist, received by teenagers as well as adults．
A．that
B．which
C．who
D．What
