深反射亢进见于()
A.后根受损
B.前角受损
C.肌肉病变
D.脑或脊髓损害
E.后束受损
参考答案:D
Every morning she has to ______ her little daughter, then takes her to catch the early bus in a hurry.
A.wear
B.dress
C.have on
D.put on
用煤气灶烧水,燃烧500g的煤气,使50kg的水从20℃升高到70℃.已知水的比热容为4.2×103J/(kg.℃),煤气的热值为4.2×107J/kg.求:
(1)500g煤气完全燃烧放出的热量?
(2)水吸收的热量?
(3)通过上述计算,水吸收的热量等于煤气燃烧所放出的热量吗?试说明理由.