预算定额按物资要素分为( )定额、机械定额和材料消耗定额。
A.劳动
B.人工
C.资产
D.物资
参考答案:A
While watching television, __________.
A.the doorbell rang
B.the doorbell rings
C.we heard the doorbell ring
D.we heard the doorbell rings
挥发油中其他中性成分可在何部得到()
A.A
B.B
C.C
D.D
E.E