A.1.2倍 B.1.3倍 C.1.4倍 D.1.5倍
A.0.35~1.30m; B.0.30~1.40m; C.0.30~1.30m;
A.在進入梳齒板前; B.立即; C.經(jīng)兩個梯級后。