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【单选题】
钢筋混凝土梁的受拉区边缘达到下述( )种情况时,受拉区边缘混凝土开始出现裂缝。A.
达到混凝土弯曲受拉时的极限拉应变值
B.
达到混凝土实际轴心抗拉平均强度
C.
达到混凝土轴心抗拉强度标准值
D.
达到混凝土轴心抗拉强度设计值
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反馈参考答案：
举一反三
【单选题】When a battery becomes completely charged, both positive and negative plates become ( ) and the electrolyte becomes ( ).
A.
H2SO4 / Pb
B.
PbSO4 / H2O
C.
PbO2 / H2SO4
D.
PbSO4 / H2SO4
【单选题】When a battery becomes completely discharged, both positive and negative plates become_____ and the electrolyte becomes _____.
A.
H2SO4/Pb
B.
PbSO4/H2O
C.
PbO2/H2SO4
D.
PbSO4/H2SO4
【简答题】重度中暑可分为:________、__________和__________。
【单选题】The positive plates in a charged lead-acid battery contain what chemical compound?
A.
Lead phosphate
B.
Lead sulfate
C.
Lead chromate
D.
Lead peroxide
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