在做闸阀和截止阀强度试验时,应把闸板或阀瓣关闭,压力从通路一端引入。( )
参考答案:错
One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (31) . She cared for them and felt great love for them.
Once the (32) and per of the two birds flew from the cage. Therefore, (33) he flew close, she grasped him (34) . She felt glad, but suddenly she felt the bird go limp. She opened her hand and (35) in horror at the dead bird.
She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (36) . She lifted him from the cage and (37) him softly into the air. The bird circled once, twice, three times.
The girl watched delightedly at the bird’ s enjoyment. Her heart was no longer (38) with her loss. Suddenly the bird flew closer and (39) softly on her shoulder. It sang the sweetest melody that she had ever heard.
The fastest way to (40) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!
(36)()
A.weaker
B.taller
C.larger
D.shorter
迷走神经兴奋引起胰液分泌的特点是
A.水分少,碳酸氢盐和酶的含量丰富
B.水分和碳酸氢盐的含量少,酶的含量丰富
C.水分多,碳酸氢盐和酶的含量少
D.水分、碳酸氢盐和酶的含量均多
E.水分和碳酸氢盐的含量多,酶的含量少