A 19-year-old primigravida is admitted to the labor and delivery unit in labor. She’s 2 cm dilated and 50% effaced, and the fetal head is at 0 station. She’s having moderately p 40-second contractions every 5 minutes. She seems rather anxious and becomes very tense during each contraction. When the client asks for pain relief, what should the nurse do next

A. Determine the source of her anxiety and institute interventions to help her relax.
B. Immediately check the physician’s order and give her the analgesic ordered.
C. Inform her that the neonate’s head isn’t down far enough just yet but that, as soon as it is, medication will be given.
D. Tell her that her contractions are only moderately p and that she should wait until later to take medication.

试验某化合物中是否含有碳酸根离子，常需使用的药品有[ ]

A．盐酸

B．石灰水

C．石灰石和盐酸

D．石灰水和盐酸