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【单选题】
关于测定CEC时交换剂的选择，下列说法中错误的是（）A.
酸性和中性土壤：一般用pH 7.0的1 mol/L NaOAc作交换剂，此为经典方法
B.
石灰性土壤：测定时的最大困难是交换剂对石灰质（CaCO 3 、MgCO 3 ）的溶解
C.
石灰性土壤：常选用pH 8.2的缓冲溶液
D.
盐碱土：交换剂应避免和减少CaCO 3 的溶解，并先除去易溶盐
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皮皮学刷刷变学霸
举一反三
【单选题】Q3 When do you start eating?
A.
As soon as you arrive at the lunch or dinner.
B.
As soon as everyone is served.
C.
When a speech is being made.
D.
When the host begins eating.
【单选题】听力原文：W: When shall we meet? M: At seven o'clock. Q: When will they meet? (20)
A.
They will meet in front of the bank.
B.
They will meet at seven o'clock.
C.
They will meet at ten o'clock.
【简答题】听力原文：Q: When the mother opened the door, what did she find? When the mother opened the door, what did she find? She found that the hall way was ______.
【单选题】Q:When will they hold the safety meeting?
A.
Before bunkering.
B.
After bunkering.
C.
During bunkering.
D.
When bunkering.
【单选题】不需进行“不溶性微粒检查”的制剂是( )
A.
用于静脉注射用的溶液型注射剂
B.
注射用无菌原料药
C.
注射用的浓溶液
D.
眼用液体制剂
E.
供静脉注射用无菌原料药
【单选题】He didn't give me _______ time when we would meet next time. [ ]
A.
certainly.
B.
sure
C.
surely
D.
certain
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