38. 有關 shear bolt 的敘述,下列何者錯誤? (A)tighten the shear bolts A until the hex heads B twist off (B)tighten the hex he
ads B until the shear bolts A twist off (C)loosen the shear bolts A until the hex heads B twist off (D)loosen the hex heads B un
til the shear bolts A twist off。