複選題38. 有關 shear bolt 的敘述，下列何者錯誤？ (A)tighten the shear bolts A untilthe hex heads B twist off (B)tighten the hex heads B until the shear bolts Atwist off (C)loosen the shear bolts A until the hex heads B twist off (D)loosen the hex heads B until the shear bolts A twist off 。