对于受拉区与受压区均没有纵向受力钢筋的梁称为双筋梁。
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气象上把()合称为“ENSO”。
A. 厄尔尼诺和南方涛动
B. 拉尼娜和南方涛动
C. 厄尔尼诺和季风
D. 拉尼娜和季风
SCLE患者ANA阳性率约为()
A. 30%
B. 40%
C. 50%
D. 60%
E. 80%
One of the differences between a two-stroke engine and a four-stroke engine is,()
A. a two-stroke engine can’t work without cylinders
B. a two-stroke engine can’t work without pistons
C. a two-stroke engine can’t work without crankshafts
D. a two-stroke engine can’t work without a blower