在△ABC中,AB=AC,ED是AB的中垂线,交AB于D,交AC于E,连接BE,∠A=36 °,CE=4cm,△BCE周长为24cm,则AB=( )cm.
14
当锅炉负荷降低时,应先减少燃料量,再减少送风量,最后减少引风量,控制炉膛负压。
In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.()
A. book
B. moody
C. look
D. cook