“V”型托辊的作用是什么?
参考答案:
V型托辊前倾2度上倾5度,能起到防偏和减少摩擦磨损的作用.
I am heavily ________ at the moment, but I hope to be out of it when I get paid.[ ]
A.in debt
B.in trouble
C.of difficulty
D.in danger
在单音程中有14种自然音程。