明代规定:臣民私事上言于朝廷用()
A.奏本
B.题本
C.启本
D.呈状
参考答案:A
___ surprised me most was ____the girl passed the driver test.[ ]
A. What; that
B. What ; how
C. That; that
D. That ;why
油石在使用过程中常因气孔堵塞而降低加工速度,因此需经常()
A、将堵塞物吸出
B、更换新油石
C、及时修整
D、用清洗油对油石表面清洗