钾在作物体内是以()形态存在的。
A、有机态钾;
B、缓效性钾;
C、无机态钾;
D、速效性钾。
参考答案:C
Washington, a state in the United States, was named _____ one of the greatest American presidents.
A.in favor of
B.by means of .
C.in honour of
D.in spite of
木材干燥后,可以提高木材的强度,延长其使用年限。