管带

如图所示，A、B两个正方体叠放在水平地面上，B对地面的压强为p₁，若取走A，B对地面的压强为p₂，已知p₁：p₂=3：2，若A、B的边长之比为L_A：L_B=2：3，则下列说法正确的是（　　）

A．B的体积之比V_A：V_B=8：27

B．B的密度之比ρ_A：ρ_B=9：4

C．B的质量之比m_A：m_B=1：2

D．B的物重之比G_A：G_B=2：3

公司股东会(或股东大会)除了选择和更换董事、监事以外，还有监督董事会、监事会的权力。( )

晶体具有各向异性。如蓝晶石(Al₂O₃·SiO₂)在不同方向上的硬度不同；又如石墨在与层垂直的方向上的导电率与层平行的方向上的导电率之比为1/10⁴。晶体的各向异性主要表现在 [ ]

①硬度 ②导热性 ③导电性 ④光学性质

A．①③

B．②④

C．①②③

D．①②③④

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles
(1) The ratio of red to green marbles is 2:3.
(2) The ratio of green to blue marbles is 6:5.

目前火电厂中使用较多的差压式水位计主要由______、差压信号导管和______三部分组成。