The crankshaft deflection is at first to be （） before and after repair.
举一反三
- 未雨绸缪,防患于未然。? Prevention|Repair the window before it rains.|Prevention first.|Repair the window after it rains.
- 【单选题】()4. ______ A. Was; before B. Is; before C. Was; after D. Is; after A. was before B. is before C. was after D. is after
- The electric shaver needs (repair) __________ before it can be used.
- The ABC excinuclease is essential in:() A: base-excision repair. B: methyl-directed repair. C: mismatch repair. D: nucleotide-excision repair. E: SOS repair.
- The washing machine ______ before it can be used. A: must repair B: needs repairing C: should be in repair D: require be repaired