润滑系统限压阀钢球磨损过大会造成压力过高。
参考答案:错
As a student in Senior Three, I must work hard.______, I should take exercise to strengthen my body.
A.Otherwise
B.Meanwhile
C.Therefore
D.Thus
小儿贫血诊断标准不正确的是
A.新生儿血红蛋白<145g/LB.6个月~6岁血红蛋白<100g/LC.2~3个月血红蛋白<95g/LD.6~14岁血红蛋白<120g/LE.4~6个月血红蛋白<100g/L