30把锁的钥匙搞乱了,为了使每把锁都配上自己的钥匙,至少要试______次.
29+28+27+…+1=435(次).
答:至少要试435次.
故答案为:435.
We should bear in mind that social development and balance of nature should go in ________. [ ]
A. company
B. sympathy
C. association
D. harmony
患者,男性,63岁,头摇肢颤5年余,筋脉拘挛,畏寒肢冷,四肢麻木,心悸懒言,动则气短,自汗,小便清长,舌质淡,苔薄白,脉沉迟无力。
治则为()
A.健脾益肾,舒筋活络
B.滋阴补肾,濡养筋脉
C.补肾助阳,温煦筋脉
D.健脾益气,以养筋脉
E.温补肾阳