更换腐蚀液时，需按照的配比（重量比）氟化氢铵∶水=1∶3进行更换。
参考答案：错
When caring for children who are sick, who have sustained traumas, or who are suffering from nutritional inadequacies, the nurse should know the correct hemoglobin (Hb) values for children. Which of the following ranges would be inaccurate
A．Neonates. 10.6 to 16.5.
B．3 months. 10.6 to 16.5.
C．3 years. 9.4 to 15.5.
D．10 years. 10.7 to 15.5.
合同规定业主应付款的时间是在收到工程师颁发的临时付款证书的28天内或收到最终证书的( )天内支付。
A．10 B．20C．30 D．56
