保健按摩师的职业道德是指保健按摩师在按摩从业过程中，应遵循的与保健按摩职业相适应的行为规范。( )
参考答案：对
Many businesses must have been badly influenced during that financial crisis, ________?
A．haven’t they
B．didn’t they
C．must’t they
D．weren’t they
简述解决死锁问题的三种方法。
