【单选题】室外高温作业的液压系统应选择粘性_____的油液。( )
【单选题】(2019 地区三模 ) Is there _____i n today's newspaper?
【单选题】Our newspaper is a(n) ________ newspaper in this city.
【单选题】下面四个式子中,正确的是( )
A.
(a+b) 3 =a+b a+b (a≥0,b≥0 )
C.
(-2) 6 ×3 =(-2 ) 3 × 3
D.
a 2 +(-3) 2 =(a+3)(a-3)