Some pumps use packing as sealing gland. The gland should be( )
A: slack enough to allow slight leakage of fluid
B: slightly blocked
C: brought up tight so as not to allow any leakage
D: fitted with a relief valve
A: slack enough to allow slight leakage of fluid
B: slightly blocked
C: brought up tight so as not to allow any leakage
D: fitted with a relief valve
举一反三
- Types of steam sealing include () A: labyrinth gland. B: fir-shaped gland. C: J-shaped gland. D: T-shaped gland
- The goitre is defined as() A: General enlargement of the gland. B: General enlargement of the gland with single or multiple nodules. C: Normal thyroid gland with nodule D: Normal thyroid gland with no nodule.
- Hidradenitis is inflammation of a __________________. A: sweat gland B: salivary gland C: sebaceous gland D: ceruminous gland E: meibomian gland
- Which of the following glands is not an endocrine gland? ( ) A: Pituitary gland B: Parotid gland C: Thyroid gland D: Adrenal gland
- 垂体 A: pituitary gland B: thyroid gland C: thymus gland D: adrenal gland